I love chassis 01R. I have a UT version and HPI version in 1/18. I think the HPI is the most accurate out there, but it's very hard to find. My HPI model only has OZ on one spoke of each wheel and solid disc brakes. Since you haven't purchased this one yet and that sounds like a lot of work for the fenders, try to see if you can find an HPI one first.
edit: here is a picture of my HPI. I have a lot of photos of it in that gallery if you keep clicking through. The rear wing broke off during shipping so I glued it on later in earlier pics (def not accurate model without the wing!).
edit: here is a picture of my HPI. I have a lot of photos of it in that gallery if you keep clicking through. The rear wing broke off during shipping so I glued it on later in earlier pics (def not accurate model without the wing!).