I have a Lone Star, do you or have you ever build anything mechanical in your life?
There is a real need to have experience and knowledge in this area. Either you hire someone, know someone or you are that person, but you need to know what you are doing. I say this not because my car is a Lone Star, but because building any car needs a knowledge base.
Lone Star is a roller coaster company. They have a good car. It has reasonable and acceptable designs for the overall systems. Of course you will need to be able to make it all fit together. One week Lone Star is on top of everything, the next, you can't get tham on the phone, but they are not much different than many other caompanies.
I found a couple of areas I need to change, but overall, as long as you don't FOBAR anything, you will end up with a good car.
If you are looking at Lone Star for the money, you should probably know I spent about $50k on mine. I think this about normal for most Cobras, plus or minus $10k.
I'm sure someone will chime in ans give you their view, that one thing nice about CC.