Most certainly do able, but you will need to fabricate upper receiver, gas port, you could just create a shroud and use a cut down mid cap (so no new feeding system) you will most likely need to hack up a wood M14 stock(real steel surplus is relatively cheap), you might be able to keep/modify the trigger guard. So you can keep gearbox, outer/ inner barrel, hop unit and lower assembly. All the shapes look relatively simple and you could cold hammer them out of aluminium or cad design and 3d print the upper receiver. This a lot for a novice. But you got to start somewhere.