Estimated price is $259 for a normal set, and $329 for a set with the clear top.
Whether or not they clear the brake booster will depend on the car. For a Mustang, there is sufficient stock in the casting to machine for clearance; on my 69 Torino, I don't think I could do anything to make them fit. Case by case basis, but if a stock pentroof will fit, mine will fit.
There will be sheet metal baffles under the breathers, but I wasn't planning any for the plexiglass tops; I would leave installing side baffles to the end user.
No coating planned for the clear tops, but I could certainly make replacements or spares.
Email me if you want me to put you on my waiting list, jayb@fepower.net