Hi everyone. I have been very busy with some more monster amps and haven't been here much at all. I will answer a few of your questions about the buffers.
A heatsink of approximately 2"x4" with fins at least 1/2" tall will be plenty.
I will supply a heatsink drilled for the reg. and the switch with mounting hardware for $10 shipped. You will just have to move things around a bit to fit in in. Placement is not critical. The basic kit has everything you need to have a working buffer, except for the Cardas RCA's, those are now included on the complete chassis. It is $349, being offered for $300 for the first 10 as a Christmas special. If there is enough interest I may decide to extend this offer so everyone interested will have a chance to get a special.
If you want a complete kit which is a fully finished unit that you have to assemble those are now going for $1595 and for the Christmas special you can have one for $1295. All buffers from this point on will be configured to be able to use the 6H30 supertube! Guys this is a no brainer, there isn't anything in this price range that can come close! I have plenty of stock on the basic kits
Please note that the basic kits in this special will include the lower cost Cardas RCA's.

Gary