Thank you grod915 and arledgesc, that is very helpful. 

The only reason I would want to source my own parts is because I think it would be fun to prep the turret board and solder the components together myself.  Do you think Nik would be willing to ship those parts unassembled?

Just trying to get a few questions answered before I thrown down some $$ my first build - this is the only layout that I've found online that does exactly what I want: both TMB and an FX loop!

The tube names shown at the bottom of the schematic show a slash between two different tube names.  Does this mean that either tube can be used interchangeably?  Should one stick to the tubes on either the right side or the left side of the slash?

Also, the first jack in the FX loop only seems to have 5 terminals.  Is this on purpose?

Finally, can this circuit be built as written on the layout with parts from Ceriatone (Tubes, Transformers, Chassis, etc), and the board/components sourced from elsewhere?  From what I can gather, Ceriatone supplies the board with components pre-assembled, and I'd like to be able to do that assembly myself. 

Thank you all for the link to the layout, and for any help you can offer me!