They're nice dimensions, and you could probably do that with 15mm glass for a ply/timber build.
No idea what it costs in London! 15mm can be a big jump up from 12mm though as it is much more difficult to cut.
Yep, could go up to say 68cm high with 12mm (210 long, 90 wide) and keep the safety factor above 2.5, I'm not entirely sure how different the calculations are for a timber framed tank vs all glass, but I'd still stick with ~65cm height for the window on a ply/timber build with 12mm.
I had a quote today from aw aquatics for a 7x3x2 10mm glass they wanted £455 this does not include delivery or drilling or sliders. Seems cheap enough to buy instead of the hassle of building in my opinion
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