Actually, Bob, the belted feed mechanism ain't too bad an option if you're running loose leaf, as opposed to compressed bricks.
Yah, brute force applied to things is always kinda scary! lol
The rotary blades have always seemed better to me, than the gate type guillotine blade reciprocating motion.
The best home-built production shredder I have seen to date was a reel type lawn mower with a 1/2hp electric motor for power.
It did not include a feed mechanism, though.
Best
rc
and BTW... IF anyone really is prepared to spend that kind of cash on a shredder, I'll fabricate to specs!
No bs.