Bonding, gluing, smeging the lid on is not something I'd not favour. It might work ok but only up until the point it fails and you get a leak, it's just a solution I'd not trust myself...
It's difficult as a o-ring grove would be hard to do and you'd need a thick piece for it to be stiff enough to compressing the ring in-between the bolt areas without bending. also getting a ring the right size and making it stay in the grove while you assemble it will be a feat.
I know you want a clear top but part of the reason I still solder the blocks as its often the easiest and surest way especially for more complicated designs.
As far as the bolts go I have a box of 100 of M2 think they are 20mm long........if you go with M2 I could send you a handful (but note M2 taps are very easy to snap in copper)
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