Good move to start over on this one----i saw the pics and just clicked off the other day because it looked like a mess that there was no fix for.
I agree with going with three preamp tubes and building a stock JCM 800 at first---- get this right and mod from there----- #34 mods can get a decent amount of boost over stock------- a plate driven tonestack can also get much more dist------ all with three tubes.
Here's a plate driven tonestack that gets a lot of gain from a three preamp tube design:
http://img155.imageshack.us/img155/6184 ... ematic.jpg
I built a 50 watter that's similar to the link and many local bands have used it for recording----i tried several different versions of values and settled on something i liked--turns out that many others like it, too----mine has the usual pre-PI MV and a Lar/Mar PPIMV.
FWIW--- i have a Marshall 4010 JCM 800 50 watt 1x12 combo (like a 2204) and i modded it up with #34 mods and a Lar/Mar-----it does what it does very well---- but sometimes i'd like to turn off the boost and have a stock/near stock JCM 800 tone that i can boost with a pedal to get #34 mod (or higher) gain levels---and something like a usable clean tone---- I'll be re-doing this one with a turret board near stock JCM 800 circuit when i get time---- I'll ditch the Lar/Mar and put a Resonance pot in it's place --- i think a Resonance control will be a good addition with a 1x12 open backed cab...........................gldtp99
....I would of made a stock amp first and got that up and running ..Then did the mods..Didn't you have any wire clippers... 
