Dude, that's an amazing idea! Dovetail-styled connectors would be a small modification, super easy to do and the model wouldn't fall over when knocking them.
In the meantime I've been running into a problem whilst trying to print this model. When I try to check/repair the model for holes and such, it fully closes the grill. The only way I can keep the bottom a single piece print would be to make the grill go all the way to the bottom.
If I want the grill not to go all the way down, I'd need to make the kit a two part thing. That in itself shouldn't be a problem, I can either keep the detailed sub-grill thing, or go for a way of going without all that detail underneath.
I'm preffering the latter option as a standard, since it would enable me to print the component in two pieces, then put them together and cast them as a single piece. But then I need to see which way I'll go: separate grill, or separate bottom... Either way should be fine, since I'll be glueing them together for the master...