Several of the custom builders have a wait list in the 2-7 year range, your deposit is just holding your place in line, your fit, design,paint, etc. will all be decided when your time comes up. That way you are not locked into something that may not be relevent, you can also usually sell your place in line to someone else if something changes, but they make you find a buyer.
The vanillas are hand built full customes by sacha, speedvagen is where he has the guest builders, desalvo being one.