You already know where to look for franken builds...
It was only a few months ago that you were throwing out a lowball offer on a 226570 franken piece: 1270 usd on a piece listed for 2k + usd in the sales forum.
To try and be helpful, there are several ways to obtain a franken.
1. Buy from m2m as you already know.
2. Collect the various parts and have a modder / watchsmith assemble.
3. Contact a modder to build who will likely ask for money up front.
This link will be useful assuming you wish to engage an RWI trusted watchsmith / modder.
Hire Modification Experts, Watchmakers, Parts Suppliers, and more.
forum.replica-watch.info