I just finished a similar build to the one rockstah completed a while back.
I followed his schematic and I used a 50watt marshall power supply...however the gain was almost non existent (because I think trainwreck's distort primarily after the preamp right?). At any rate, I added a PPIMV to crank some gain out of it.
I'm left handed and when I made the video all I had was a right handed guitar