Should I build up a second frame while I drive my truck??

[C10_ForDad]

Alright. The title may not make the most sense but bear with me. I have a local line on a C20 frame, its a roller for 150 OBO. My 1970 is a C10, they are both lwb's and 2wd. Im thinking while I drive and enjoy my truck to take this other frame, strip it down, paint it. Add a Porterbuilt trailing arm crossmember, custom trans crossmember, add raised bed supports, route new custom exhaust and fit a gas tank in the rear frame rails as well as set it up for airbags. Then when its all ready swap everything over to a nice clean frame. My frame currently is okay although its very grimey and does have a lot of surface rust, but I want to enjoy it vs it being up on jacks its entire life. What do you all think, take the plunge for 150 or not?