Reply by DannyB

Stop trying to think in terms of how many individual clamps you need.

If the goal is to exert 900 PSI evenly across the piece, you aren’t going to need 335 clamps.

You need just a few cauls and clamps to hold them

The cauls will distribute pressure evenly up to some amount
For example: http://www.woodpeck.com/ottclampingcauls.html

These say they will deliver up to 225 lbs evenly.
So you’d need exactly 4 pairs of cauls (8 clamps) to get to 900psi.

Now, that may not be possible to fit, but it’s certainly better than 160 clamps