You saw the bottom.
The top side:
The tubes are mounted on an iso- suspended mounting plate, 3mm aluminum.
Chassis is the 240mm wide x 360mm x 70mm Projekt style. Very rigid.
Sockets are teflon, except for the 310a.

The RCA input is at the back where you like it. Although the output transformer comes with 4/8/16 secondary, there are only 3 speaker binding post: 0/4/8 or 0/8/16 - whatever suits.

Horn guys: These are quiet! 0.2mv.

Running in now and I'm mighty pleased with how this has turned out.

Next I'll get out the adding machine to determine where this lands cost-wize.