Welder454, Thank you for posting the pictures of your amazing looking bike, it has helped me identify the donor of one of my e-bikes.
I looked at the forks and wheels on your bike and they looked familiar, I had never heard of Riga mopeds before and did some Googling, and it looks like I might at last have found where my bike came from.
I bought this:
It had already been modified to house an RM80 gas engine and I had no idea of the original manufacture ..... looks like it was Riga!
I found this on the web it is a Riga Delta.... looks like the same frame to me, I even have the original shocks
Eventually it turned into this:
So thanks for helping solve the mystery,
Now back to your bike. What motor did you use?