You know, that that is a good idea instead of etching. I have another project in mind for my salt water tank that I can play with PCB.I use perf-board, plated through holes.
It's less hassle than etching boards.
The most time-consuming part of making these is
fitting flying leads to a mini-molex plug.
I usually stagger the transistor legs, then line up the resistors
to the appropriate legs. The transistor can be bent over the
resistors to reduce the footprint.
The board ends up being just slightly larger than the transistor,
and has a really slim profile. Put a bit of backing on the solder side of the
board, slip the whole works into some heat-shrink and you're ready to go.
One of these days, I'll remember to take some photos when I
put a few of them together.