Terrible lesson
. I bet the shavings got transfered from the crank case to the cylinder and port walls.. over time I can predict this would cause scrapping depending on how large they're. I wouldn't say the cylinder is trashed Completely but I can reasonably guarantee honing it may give it more life. But seriously not worth it. The transfers have some bad areas that need to be filed. Could be past factory casting but the run wear is toasty. Not sure if it looked this way before. But honestly... Hawk the motor to the part graveyard and get a new kit. Think of it this way with China dolls. You'll spend more money and time buying parts separately then buying an entire new kit possible inherit a lemon or an apple.
Without a doubt however with a very high automotive sand paper you can salvage this for a later project. But it isn't going to run great..
Match up the pistons from the other top end bikeberry kit. If the holes on the piston kit match. You're game. No piston replacement. Possibly just rings and that other cylinder is probably salvageable.
After assembly. If say definitely check the squish gapping. To be sure the piston has clearance to the cylinder head. With the head on, plumber solder bent to an L. I believe if it's between 8mm-10mm? You should have enough clearance for the spark plug. Taking a mm off the cylinder head gasket area with 140 topped off with 600 grit and measuring with a digital caliper can reduce gapping (vice versa). You will have to drill out the stud difference. After all the cost in parts and tools. It's not worth it.
Wanna spend a good 150 and don't care for top performance. Get a Zeda 80-100. Wanna go crazy? Get a Phantom 85 V3. Wanna go nuts. Get a Minarelli. Wanna go absolute lunatic . Get a Athena.