Don't worry about running higher than 32x Inductance rule because the motors won't be damaged or wear out from heat. You'll find they will happily run at 70Vdc without any issues from heat. The extra voltage is welcome because it gives more speed and to lesser degree torque.

All machines I build get fitted with 2 x 25V 500 or 625Va depending on number of motors. 625Va for 4 motors with Seconderys wired in series. This gives approx 68Vdc output. Don't go higher than 625Va else you'll suffer with In-rush current tripping fuses etc.

Regards Capacitors then you don't need one large Cap. You can use several wired in parallel. Infact your better doing this because it lowers ripple and is much cheaper.
3 or 4 x 4700uf 100v is what I use.

This is what I fit given your motors etc.

Toroid = 625Va 2 x 25V
Caps = 4 x 4700uf 100V
Bridge = 35A 300v or higher.

The wiring is simple as it gets. See pic to give an idea of how simple.

Click image for larger version. 

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