I'm looking for some advice from the collective here on which way to go with my project. It all started about a year ago with a free 1993 RM250 frame, swingarm and shock. Then I got a PE250 engine and pipe from a friend, but it was in rough shape. I bought a KX500 front end and got that adapted to the RM frame, and also got an RM rear wheel, creating a roller. Realizing that I would need to alter the RM frame cradle to accommodate the side exit exhaust, and also in search of a better engine, I ended up buying a nearly complete '79 PE250 a few weeks ago, which was missing a tank, seat, exhaust and some electrical parts. My original thinking was to graft the frames together, using the PE cradle and rest of the RM frame. It's a significant amount of figuring/cutting/welding with lots of potential to go sideways. I have crap welding equipment/skills, but have access to a friend with some good equipment and a developing skillset. My intention is to have an old school looking/feeling bike that has modernish suspension and brakes, that can be ridden aggressively. The PE had some electrical issues, which I was able to sort out and get it running. About this time, I started to think about using the PE as the foundation, and adapting the KX front end and the RM swingarm/wheel/brake, using some Chinese RFY shocks like ShinyRibs did on his XL500. This could be a lot less welding/fab work, but I suspect the end result would not ride as well as using the RM frame. It does sort of maintain the PE heritage, although I'm not a purist and it's not like I would be ruining a nice PE. Using the PE frame solves many headaches, like working out the exhaust pipe, frame mods, intake routing, but introduces some other headaches like figuring out a rear brake pedal/mc mounting, fabbing shock mounts and making the junk shocks work ok. Using the RM frame would probably result in a better handling bike, with better ergonomics and a sturdier frame. I also have a better handle on the paperwork/registration for the PE, while the RM VIN is going to require a bit more creativity and/or process. So I believe using the PE frame will simplify things, but I have to admit that figuring out solutions to the problems can be a big part of the fun for me. I don't really have any bodywork for either bike, and I'm expecting to either have to find/build a tank and seat for either frame, and scrounge up some fenders, etc. There aren't really any vintage racing options in my area so meeting vintage rules is not a concern of mine. Just want a bike that is fun and not scary to ride on the steep, rough trails in my riding areas. I don't have a big enough budget to consider restoring the PE to original, and I'm not really interested in that either. Mountain trails and drum brakes just don't work together for me. This is going to take me months/years to get done, as I have a full time job, family, and other bikes and hobbies all competing for my time and money. This SAR forum is probably my favorite thing on the internet, for some reason I just love all these custom projects. I really enjoy all the creativity and ingenuity I see on here and really respect all the skills and knowledge you guys have. Any thoughts, what would you do if you were me? Things I should avoid or watch out for?