I can see exactly what you're getting at, I prefer enclosures over tubs but don't like scooping out substrate, unfortunately it seems more complex than its worth.
You would need to build the enclosure and then some sort of stand to house your uth as well as your sliding track. Unless you're quite handy and want a project it'll wind up costing a good chunk of change to get made. Although with doors and a nice wood stand and frame, it has potential to be a good looking enclosure.
If you do it I would suggest mounting a RHP instead of uth.
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