I was toying with doing exactly that, but the issue I have there is that the tubes at that scale are only a little over 4ft in diameter. They'd have to be literally double that to serve as a turbolift.For the turbolifts in the rec dec, I always imagined they came in horizontally at second level and lowered themselves down to the first level for folks to get in and out... There's clearly no way in can just be a vertical pass through, but I think they have to be turbolifts given the design of the tube there.
What I 'might' do is have a go at making the room a true rectangle instead of it being wedge shaped to fit the lines of the hull structure. That would make the gallery area an extra 3m (9ft) wider, but I think even then it wouldn't be quite enough to comfortably fit usable turbolifts.