First question is why would you want to build your own Tx?

Whilst building transmitters (and receivers) from components was not uncommon when I started with planes (don't ask how long ago) modern gear is so good that there is little reason to try and build your own (except maybe just for the h*ll of it).

If cost is the issue you are probably better off looking for a second hand Tx, with lots of people moving to 2.4 there is a lot of cheap 36Mhz gear around over here, I assume it is the same with in En Zed!

Terry