I've never tried it on a stock body but I have done it on a clear body that I painted myself and that was a HUGE PAIN!!! Lexan paint bonds to the plastic and it dont want to come off. In order to do it on a custom painted body you spray it down with Dot 3 brake fluid and let it sit for awhile...
Youd have to make new body post holes in the body which in and of its self its a huge deal but you will need to do that if you used this body. You may need a pair of lexan scissors in order to trim the wheel openings a bit if the wheelbases are different. The main problem with using this body is...
Bro, I hate to ask this but are you even looking? One quick google search for "arrma kraton 8s body dimentions" returned these results at the very top of the page. I pulled the dimentions of the redcat body up right on redcats website.
Product Dimensions
23.2 x 10 x 6.5 inches
Heres the specs on the body it comes with. You'll need to look around at RC bodies that have close to these same dimentions. I'm not familair with Redcat brand kits so I dont know of anything right off the top of my head.
Length - 22.5" or 571mm
Width - 6.5" or 165mm
Height - 6.5" or 165mm...