What size flypress are you talking about?
Is it a forging press as opposed to a flypress? (Speed of ram travel is the main difference)
Normally flypresses have a very rigid frame, and sit on a "table" or similar with access through the base to allow punched out blanks to be removed. Which means the main impact is taken around the base and not in one compact area as under a power hammers tup.
Deflection of base / bolster plate I have not found to be a problem, the torque imparted when using them is usually more of a problem, and they have to be secured firmly to stop them walking round in use.
As for a base, I have them securely mounted onto a table which is firmly bolted down and has a top made of 3" thick timber with a 1/4" steel plate on top between the press and timber preventing the flypress compacting the wood and allowing it to "bed in", it also helps to have large steel washers under the table top to secure press in situ with suitable nuts and bolts
The table also has holes through to allow blanks to drop out when punching out shapes.
The one I use mostly for forgework is mounted on a steel plate top,(again with a hole through) supported by structural channel sections at a convenient height, and then welded to a base plate which is firmly secured to the floor. The channel is directly under the press's base casting which leaves access to the blanked out parts.
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