Yes Drums' I feel your concerns. The original nos rear guard is a fairytale in my opinion and I wont spend $700 on one, that would be 20% of the bikes value just there.
Same with the special tool, I had to have some made, and only got it done thru Frosty's goodwill to lend me an original for a couple of months for an engineering place to replicate. Thanks again mate!
I was trying to make my 250X perfect as well, and its a beautiful bike, I just had to make sure the perfection didn't consume me and effect the motivation. Its only a matter of time before higher qual rear fenders are available and you can replicate the white decal on it to give the original look for the meantime. Tank decals will be ongoing misery whilst it has had fuel in it. I fit an old ugly tank when I start it up, and put my restored tank back on to look great if its going to sit for a while.
I still have to somehow find indicator mounts, battery box, and some small nitpicky things too.
You'll get there with it, ol' mate.