If you are talking about
this plane, then No. Planes on this scale are going to be very difficult to reproduce. The smaller you make the plane the more difficulty grows. You would be far better off starting over with something like the Tiny Trainer. Bigger plane are just easier to fly, easier to see & less effected by the wind.
In general, Yes, you can put the electronics into a new plane. Buy replacement parts for the original or build a FT plane, it's is your choice. If you chose to build, the new plane should be similar size to the original, within 10%. Don't make the new plane 50% larger & expect it to fly.
FT has a wide variety of planes sizes, measure the original & pick something similar. For example, if the original had a wing that measured 400 square inches (40x10 inches). Pick a FT plane with 400 to 440 size wing. If you give us the size of the wing we could offer more suggestions.
I would recommend picking a similar size plane over scaling plans larger or smaller. Scaling could work but it just has more of a chance for error, it's a more advanced skill. We will be able to offer more help with a known FT plan that we are all familiar with.