Nothing wrong with housing joints, I just think they're a bit OTT in a wardrobe that'll only ever hold e.g. folded clothes. I don't use any kind of spacimg jig with my Domino, just use pencil marks referenced off the back edge of the carcass. I have the original domino with pins (not the later 'paddles') and in theory, you can use the pins to space out a run of dominos - in practise though, they're much too close together done this way, so I stick with the low-tech method.
I'd agree that electric staplers are a bit puny, but all it's doing is holding the back on until the adhesive sets, so I haven't found it to be a big deal, personally. They're cheap enough to give it a try, anyway - mine's just a basic £30-ish Rapesco nailer/stapler, though I wouldn't recommend it as a pin-gun, just a stapler!
It's a fair point about not chopping into original skirtings and moulding - your only option here is to scribe an infill. As I mentioned further up the thread, I use a basic 'profiler' that I bought from a tile shop ages ago, then coping saw, jigsaw, whatever. Actually, I've found I can get pretty close in thin material with a couple of chisels and some coarse abrasive - fast too.
Spray painting gives a fantastic finish, for sure, but you need quite a lot of space to do it properly, something I don't have. I get good results using a foam roller, then blending the paint out with a soft brush. I also try and emphasise the 'hand made, hand painted' appeal of the stuff I make
I've only come across acrylic mouldings for skirtings and coving - Decorating Direct do quite a wide range - gives a nice finish, but nasty stuff to cut and work with. Haven't seen blockboard for donkeys years - to be fair, I haven't looked, either - but I'm pretty sure the internal 'blocks' or 'beams' were just staves i.e. not continuous throughout the length of the board. As always though, happy to be shown how wrong I am
Cheers, Pete