Actually a lot of the Panzerstellung were specially-built turrets with thicker overhead armour to resist artillery (classic military mindset: "we have a problem: Fire lots of cannons at it.")
While you can remove the autoloaders from many soviet cannons it's probably not necessary. Modern turrets tend to be huge (even though the bustle racks and stowage will probably be left off) and you'll need a generator to efficiently turn it to respond to threats. That and they have a lot of electrical systems in them anyway.
Turret-bunkers have an interesting history. I'm just reading "Tank Turret Fortifications" Neil Short (Marlborough, 2006) ISBN 978 1 84797 367 2 * which is available for fifteen bucks as an e-book
(*Okay for a good popular history work. The facts are good but Short's conclusions often seem a bit iffy)
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