I kinda figured something like this was on Ian mind, since he hasn't been saying much. And as much as I would hate to see him give up on his project, in the end it's just a car. If it's just causing frustration, and he is getting no joy from it, it makes little sense to keep pushing at it. He has preformed a lot of customization to the vehicle that nobody has ever done. As such there is a mountain of engineering issues that are going to come up, small things that affect other things, that affect bigger things. When you tackle as many things at once as Ian has you can become overwhelmed quickly. That said I have full confidence that he can solve the problems he will come up against, and would love to see him do so. But Ian will have to decide if it is worth it to him to deal with all the frustration, time, and money that it is going to require to see this through.
Take note of all the little things he has run into, and consider that car manufactures go through this every time they bring a new car out. They have teams of individuals to accomplish this, and it can still take a tremendous amount of time. The LF-A has been in development for the better part of a decade. Ian is only one man, and he has changed, modified, or upgraded a good 75 to 80% of that car. It's no wonder he's a having a little motivation issue right now.
Ian you have my full support whatever it is you decide to do.