Them Bolts

I've snooped around on the net a bit for reference photos regarding the playfield hinge bolts, and I found that more or less all pinball tables have a bolt-through solution.

Check out Medieval Madness here, for instance.
It's not immediately obvious that the bolts are there, but they are.

So I'll go for the standard solution - I mean, those tables have lasted for eternities without falling apart!

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Said and done, and it doesn't look bad at all actually (besides from a little wood chipping, but nothing a little filling won't fix):

1) Attached brackets. The bolts are visible from the outside and will thankfully NOT cover any crucial graphics!