I'm working on a new budget TM design that will use the curved cabinet PE .38ft3 enclosures. It will use the SB acoustics 5.5" driver and Vifa XT25 double magnet tweeter. Cost should be around $325 for the drivers and assembled crossovers with full plans. This kit will be nice because you won't have to have cabinet building skills, and the price is right. None of my kits have an upcharge for R&D, so what you get in the kit is the retail you would find at the major part distributors, like PE and Madisound.
Jed