Sorry about the tank andy but that things about to get "caved and paved" as my old school autobody guy calls it. N
What a waste
DON'T DO IT!
Do NOT ruin that tank trying to make some "cafe" bike out of it.
Do a search for DME and see what you can do with 2 K tanks.
I bought 1 good one and 1 trashed one for less than $80 and turned out this in 1 day.
Then I bought a cheap fiberglass seat base off eBay and a brake like from Carpy.
Now when I want to ride in Rat Cafe style, I can. The rest of the time (99% of the time) I have a classic mod/resto '77F. It's the best of both worlds.
Hell, if you want to trade, I'll send you my cafe seat and tank for your stock seat and tank. SERIOUSLY.
Or, I have a donor K tank that I'd sell you cheap. I also have a good '77/'78 K tank that you could "cave and pave".