I guess what I am considering is putting the 512K motherboard and back case onto the upgraded Mac Plus I already have. Essentially, I guess I am wanting to return the Plus to it's original 512K spec, as it left the factory. The only thing making it a Plus is the mobo and case, as everything else is still 512K spec.

If the Plus wasn't in such good condition, I wouldn't have even thought twice about it. I want the Plus to return to its former glory, but I don't know if I will be ruining a very good example of a Plus or not. Thoughts please!