I use a 3HP PC router under the plywood extension for my UniSaw. Just
bolted the base under it (recessed the bolt heads of course.) Used a
stiffback in close proximity to the router and did not double the ply
which would have limited the bit projection through the table. Metal or
plastic sub base insert might be better but I didn't have one. Have used
this setup for years and have no complaints.
Rabbit

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Lon Marshall