XR200R/CRF150 Frankenpit build.

I'm just looking for opinions good or bad, I'm leaning toward the bad idea but I just thought I'd throw it out there and see what people think. I've got a friend doing a backyard 125/150 pitbike series this summer. So I started looking at CRF150Fs, most of the guys have fully built bikes with big bores. It would probably take 4k to buy and build a decent CRF which I'm not going to do. So I'm in the garage and I look over at an 82 XR200R that I have sitting. I started doing some measuring and the bikes are very close in size. It just needs 16 and 19 inch wheels which on paper will be very close to a 150 in dimensions. I was going to do a newer swingarm on it but I haven't found anything that will work, and since the later XR guys use the early shocks I'm just going to have Slip do the stock shock for me. Which brings me to the front. The hot setup is either the BBR kit for the stock or a CR85 front end. Before I hit ebay for that stuff I had a thought, I have a complete front end, hubs, and front and rear brakes from a mid 90s KX250. Now I know the forks are going to be heavier than the CR85 forks but maybe not too much more than the stock CRF setup with the steel rims. The forks can be lowered relatively easy, I haven't looked at the spacing on the swingarm but since it's steel mounting the rear caliper would be easy. It might look a little strange with the burly forks and hubs but the brakes would be better than anything from an 85 or 150. It's already got a shortened 2009ish KTM SX rear fender and number plates and a 2014 DRZ125 tank and seat so it's not going to look like a normal 150 anyway. Yea or nea on whether the big bike forks are going to be too heavy. Depending on what I find when I split the cases I'm either going to build the 82 engine or find a newer one, there doesn't seem to be a whole lot of difference until the CRF150s and 230s.