A KGSS would be nice to build but parts are a problem so an all tube amp would probably be better all round. Then there wouldn't be a problem with heatsinks and we could use some very cheap tubes which are in ample supply.
As for transformers there are those R-cores on ebay and many other places. I got some recently and they are very nice quality and some even have two 0-xxxv windings which would suit us. Most have filament windings but for a two stage amp we would need two separate windings which could be a problem.
The PSU could be something simple (R-C network) or something along the lines of the Gilmore designs. I'm going to be testing a cheaper sub to the 2SA1968 soon so that made the PSU a whole lot cheaper to build. That said, the 450v capacitors aren't cheap but what can you do...
We could also always just wire it P-P like this:
It would have been much neater if I had been able to buy all the parts I wanted to use but I promised my self to use the cheapest stuff I could find locally.