Great tutorial, I manged to get to the end, and I learned a lot.

But I get an error:

66: min relay fee not met (code -26)

I can't calc the fee in electrum, its emtpy, so it will not give me the total, only per byte:

https://i.imgur.com/BGOKizL.png

300 sat per byte.
So I gave 50,000 sat fee, to be on the safe side.

now I am getting

16: mandatory-script-verify-flag-failed (Signature must be zero for failed CHECK(MULTI)SIG operation) (code -26)

Address:
https://btgexplorer.com/address/AG6JFd6GebjuDRCB8SMvjhTqgehXLDRveR

I did it for this transaction:
a4c64944cfc57822c460436d7fd359bb641cf63e86ba95f50bf5789516bd160b