Re: What are your thoughts
Looks workable to me. One thing I will suggest is you be very careful to keep things straight and true when modding the frame as bent bikes tend to break and wear in strange ways.
Be SURE your guy knows what he is doing before you trust him with your life at 30mph.
I've been welding over 30 years and I approach bike frame fabrication with respect. There's not much room for error in a bike frame since there is so little structure.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.