Nucleus. Nucleus has the spot above the interior rooms which you can wrangle jump to and then get a view of the entire middle area.
It's not overpowered, the huge disadvantage to the wrangler is you can only be focusing on one person at a time. Soldiers and demoman can easily take it out.
Stop worrying about the wranger and just do nothing, seriously. 90% of the time an engie won't even try to get up there, the other 10% it won't be gamebreaking, and if it is, then you don't have enough flanks or cover, and that's the map's problem, not the sentry position.
Blindly following a mantra like "never use nobuild" isn't map design.
Nobuild is a tool, not a cop out. It's meant to be used. I don't know if it's appropriate in your map, and I don't care. I'm saying don't be scared to use it because you keep hearing not to use it, or because you think building on a 1 HU clip on the side of a cliff or in the out of bounds area is a "map secret."
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