Hey friend just don't think that way >>
I try to focus more one the design and finishing the product than making crazy never ending prototyping about something that was not designed for this great engine in mind.
I just designed a good decent Mode7 for this engine that its not finished yet but soon it'll be , and it wasn't impossible, But it wasn't easy at all !!!
You were doing ok with your prototype, but the thing was that you were in a lot of different prototyping at the same time >>>
Just keep on doing your things friend and God Bless you and your family !!!!