Perhaps I'm being overly safety conscious, but this is not as safe as it could (or should) be.
Please don't take this as me singling you out, but I feel obligated to put this here for people who may read this thread in the future.
You clearly understand the risks, and you also seem to have done a very neat job with your wiring.
I just want to say that this is not really the correct way to do this, (ie it does not meet electrical safety standards) and I'm saying that for the benefit of the next guy who might not have your expertise or properly understand the risks.
A better way to do it would be to use an electrical box fitted with a standard outlet, and to use solid, not stranded wire.
This would give a solid mount just like a standard wall outlet, into which a power strip could be plugged.
Total cost would be under $5. Is it worth even the slightest chance of a fire or a shock just to save $5?
Another hobby of mine is building cannons.
A group that I am a member of has very strict rules for barrel wall thickness and other aspects of cannon construction.
A lot of newcomers see these measures as overkill, often because it makes construction a lot more difficult and expensive.
It's possible to make a cannon out of a piece of plumbing pipe, and it may last ten or even a hundred shots before suddenly turning into a pipe bomb. It may never explode at all.
Thing is, when you're firing a cannon, you want to KNOW it's not going to explode.
I want to KNOW that my cab will never hurt anyone or cause a fire.