Thanks,
All my own doing - everything from the cab to the preamp and the amp. I got some inspiration for the preamp design from the Ampeg VH140c.
The grill is strips of wood glued on. It thought it would look better than cloth (plus I didn't have any cloth )
Attached are the preamp schematic, the amp schematic and a couple more pics.

I have a couple that I just recently finished that may be interesting (they are to me, anyway). My first tries at building guitar amps, I think they came out pretty good. I'll show the smaller one.
It has a 10" Copperhead speaker (Eminence), 50 watt SS amp (DIY), and a SS pre (details: http://www.diyaudio.com/forums/solid-state/182911-guitar-pre-clean-some-sizzle.html ).
How it sounds: http://www.youtube.com/watch?v=zE-RRCuOYtk

Hi,
Transformers don`t hold a charge.
Caps can, depends on the circuit they are connected to and if it bleeds them down (most will). To be sure, you can do the resistor thing to drain them.
For most solid state gear, the caps are of relatively low voltage - 40V or so will not `shock`you but can take a good sizes chuck out of a screwdriver it you short them.

Best paper for the toner transfer method is http://h10010.www1.hp.com/wwpc/us/en/sm/WF06c/A10-12771-215517-3445097-3445097-1830369-1830370-1830373.html HP glossy presentation paper (or equivalent). This is thin like magazine paper but ready to use and white (of course). It soaks off very easily and is cheap -$15 for 300 sheets.

No chance the iron will delaminate the copper from the board - use the highest heat lots of pressure.

The key to a good transfer is cleaning the board. Many say scuff it with sandpaper or steel wool but I`ve found that all it really needs is to be cleaned with a good strong solvent, like acetone. I use lacquer thinner, which is nearly the same thing.

For etchant, I use a mix of 1 part muriatic acid and 2 parts peroxide. The acid is available in most hardware stores - it`s used for cleaning brick, concrete, etc. The peroxide at the drugstore - 3%.

I`ve made MANY boards this way.