Wow Greg, not sure how I missed this one? I commend you for your efforts on this build and the dedication to your charity.
This will no doubt be a very cool car and very capable car for sure.
Two things that come to mind. And I know you did ask for my opinion so please take this with just what I seen over the years in our car hobby.
First is I couldn't agree more with Marty on this one. Do a raffle it is way safer and can protect your interest much better? Promote the car on every forum you can get on, now this is where I would get on the phone with Marty?? He has some experience at promoting a build on the internet?? Remember a little mini truck he built?? I had a customer that built a Chevelle for a charity (no where near the level of this build) but they did a raffle and I think they raised over 50k for the charity. It was for batter women to help them get back on their feet.
The second is and I may get flamed on here (

) just kidding guys. But you said you are trying to build a car not to your taste which is very hard todo when building a car. But you are also building the car to a smaller segment of our hobby? You are also building a car with more of a race car feel then a street car feel? Dry sump very cool, oil primer very cool, but very race car? Believe it or not not everyone likes the cars we build, and the street rod segment is still way bigger then ours. And I don't mean 30s, 40s and 50s street rod but our same cars? Maybe street machine would be a better word.
It's hard to put it all in to words on a forum but I think you can get an idea of what I'm trying to say?
Not in anyway am I trying to say that this car wouldn't be very bad azz, but you will appeal to more poetical buyers or ticket buyers if it was maybe toned down some from the PT crowd and built more for the man stream hot rodders?? Just my thoughts and either way it will be very cool and if I wasn't all the way in the Midwest I would offer to do the body and paint for you on this in a second?? But guess that's what they make transport for right. Please don't take my comments as negative not trying to do that at all, just want you to get the most possible for your charity!!!