I know this topic is essentially over, but for anyone who might stumble upon this thread with the same question:
What I did was I bought one like this one here for 90euros [Source]
They're essentially build-yourself, meaning you get the individual parts and can then happily play IKEA (its fairly easy tho, just a lot of screws).
The top is supposed to be securely screwn on, and it has two front glass doors.
What I did instead is i added a piano hinge and two trunk locks, so now I can still open it at the top! (Note: To provide belly heat with an UTH this specific tank still required modification, such as drilling a few other holes and adding a second glass bottom on wooden rails in order to put the UTH in there)
Personally I disliked the look of OBS wood, so I completely covered the inside walls with cork plates and a coconut mat, and am still planning to paint/cover up the outside. It holds heat and humidity wonderfully! I barely ever even have to spray it down.
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(That at the bottom are the wooden rails meant to hold the 4mm glass floor, just not put in in those pics)
It was bout three days worth of building this thing, but the end product is a very nice viewing tank without having to sell your kidneys! Sorry about hijacking this with a long post, but for future reference and anyone finding this over google, that would be my solution to open-at-the-top...
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