I'm still in the planning/saving stages and haven't ordered a kit yet, but I'm leaning toward FFR because they offer the most options to personalize their package.
Obviously, you have lots of competition these days and some of them are very high quality- and each has their own style of offerings and customer options.
IMHO, if you were to offer a comparable style of package for a competitive price I think you could hit a home run with your quality package. Of course, you could still also offer the other options you already offer, but this frees up capitol from labor to hire people to handle shipping, filling orders, and customer service- which is obviously also very important.
You already have a very important ingredient- customer and brand loyalty. Getting the package to your customer in an affordable fashion will only increase sales and word of mouth, IMHO.
Besides, many guys like me enjoy the build as much as the finished car/driving experience. As long as we don't have to work for NASA to figure it out!
- Bob