Couple of questions: 1) "main frame was no longer in one piece" Did you break the bike's frame getting the engine out? Where and what type of break? Can you post photo?
2) you pulled the piston and it popped and moved again. Was it a bearing holding it up or was it in gear and the transmission seized?
Except for the seized engine and maybe the broken frame, appears everything else on your wish list is not actually related to the problem you had with the engine. If your cases are good and your top end is good, you're looking at crank, bearings, gaskets and maybe some transmission parts if that is what caused it. Not familiar with aus currency, but it generally isn't a financial catastrophe to have a two stroke seizure. But looking at your other wish list parts, and the broken frame--your bike may be at the point where it isn't worth it to bring it up to snuff. And why the listing for the shift lever and kick start lever??