I bought a HF joiner, the type with the metal fence and so far it seems to be a pretty good little tool/machine, but I think that its function could be enhanced with the right jigs. As you know HF has a tendency to not be extraordinarily accurate.
I saw one video where whatshisface (can't remember the name) made a jig using the older HF cutter and pretty much stripped it down, but I'm thinking something a bit less involved, just something to help line up things, but so far in my searches I've come up a bit empty .
I made the little box
and used biscuits and it's really strong, but lining up the cuts wasn't particularly easy and took quite a bit of trial and error and the mallet came in pretty handy along the way. While this works I can also envision me wasting a lot of more expensive wood trying to get it right and even the plywood ain't cheap.
I should mention that the above box is made of 1/2" plywood and almost everything I've read mentions use for 3/4" stock. Cutting into the edge is not a problem, but the adjoining face is where things get a bit tricky.. I just clamped the pieces in a vise and eyeballed it, but I'm thinking there is an easier method.
Yeah, sloppy glue on the one corner.. It's just a lock box to keep the thieves in the family out of things.. Pretty was low on the list of worries..