What i have found that works best for me is the following: Batter grip, used for ergonomics rather than need battery life, I find that my grip and being able to change orientations' (horizontal to vertical is a plus. I have attached Op-tech USA to right top and right L corner & used a combination of Pro-strap and harness for a system carry. I at times will tap my camera body and am top concerned with residue as it can be removed. I have not until now put screen protectors on, but am going on a crop body Sony that has the film bubble. I most of the time don't remove Sun Shades, they do show some wear, that does not bother me. That application (website) that I shared does look interest for SS protection.

Thanks for lettings share my experiences! J R.

If you are so worried about marring your camera just do not use it.
I, for one, could care less as I use my cameras as intended. No abuse but if body has a scratch, or surface wear, so what?
Same for my lenses.
Why, I keep my equipment past expiration date of resale as it works because it is that well built, like my 2008 Jeep, perfect running condition so why waste money on a vehicle that can do no faster or better.
Quit worrying about the camera appearance and spend that effort shooting and getting better or whatever.

The 3M products stick on. Hence I would steer clean of them, they would leave a residue on the camera if left on for any period of time.
https://www.amazon.com/Anti-Scratch-Camera-Cover-Protector-A7RIII/dp/B07ZYYMDBK/ref=sr_1_4?crid=1AU5MCOSHRASR&dchild=1&keywords=camera+body+skin&qid=1599308704&sprefix=camera+body+skin%2Caps%2C164&sr=8-4

There are many other SKINS that do not stick on. Here are a few. BUT, as many others have stated, these tend to get in the way. I have owned over 80 camera bodies and have not needed ONE body cover.
IMHO, I would not bother with them.
But, here they are in no particular order.
https://www.amazon.com/s?k=camera+body+skins&crid=1AU5MCOSHRASR&sprefix=camera+body+skin%2Caps%2C164&ref=nb_sb_ss_i_1_16

Back --in the late '90's/early '00's-- when I did camera restorations/refurbs/customizations, I re-skinned lots and lots of cameras. While one of the 'usual' processes was to completely remove, restore, and re-glue the original skin, I likewise did plenty of complete re-skins, using 3rd party leathers of many types. At this point, I only have a handful of 'customizations' I'd done, and attached are a few examples of those (they're old photos, so please don't take them as anything other than what they are... I still have a few of the ones I'd refurbished, and I doubt that there'd be any use in posting better, more recent, shots, ).

I have no knowledge of what 'skin' is presently on your SONY, how it might be attached, or what processes it would take to properly remove, prepare the camera body, or re-attach some sort of aftermarket 're-skin'. Generally speaking, 3M products tend to be very good --adhesive-wise-- but the 'skin' itself might be fairly generic, and would be no more scuff or damage resistant than the skin that came on your camera. A 'customization', on the other hand, would be an entirely different matter. The rangefinder Kiev shown in image #2 is still pristine, and I DID use the camera extensively for a number of years.

Ultimately, for the purpose you stated, there is no reason to re-skin your camera. If, on the other hand, you wanted to make your Sony a 'one of a kind' sort of beauty, then sure, go for it.

When I first stated with my first "valuable" DSLR, I got a fitted neoprene cover. It was just a hassle more than a protective device. Nowadays, I don't believe in purposefully abusing your camera, but trying to keep it pristine is not a good use of a camera. They should be used, always handy and ready for use, and trying to keep it pristine and looking unused is the wrong approach to photography. I have found an L-plate takes much of the abuse that would otherwise befall the camera. An L-plate works with quick release clamps on your tripod / monopod.

I have wanted to get a medium sized Billingham shoulder bag for a long time. I've long known that Billingham makes a quality product and rarely see a negative review. I love the care and craftsmanship that I've read goes into these bags. The main thing that has kept me from buying one has been the price. They are not inexpensive bags. Last night I saw that B&H had a sale on the Billingham S4 shoulder bag and, while it still isn't "cheap," it was priced a good deal less than what I saw for the same bag on EBay and other sites.

Have you even had one of those items that you put in your cart and removed from the cart several times? That was me last night. $199 was not a bad price from what I've seen for a medium sized Billingham bag, but it's still a lot of money for a shoulder bag. In the end, I decided it would be part of my early Birthday present to myself

I hope it lives up to the hype and the price. I plan to use it for around town trips where I'll carry my 5DIV and a couple extra lenses.