As far as heat dissipation the 4U is more than adequate. As soldersober said it will be tight installing the Salas inside but not impossible. You can probably install it on top of the PS with some tall standoffs. At least that is what I have done with the BA-3 board on the BA-1 and F4 I own. Yes I installed a BA-3 pre inside my F4, preferring it better that way.
Thanks, everyone, this is very helpful.
Do you happen to have some inspirational pictures of the inside?
Do you happen to have some inspirational pictures of the inside?
The vfet is a really tight fit in the 4u. I'm sure you can get it all in there, but getting to some things will be awkward and frustrating. If space isn't a concern, where the amplifier will be sitting, a 5u will give you a lot more room to work. Which can save a lot of frustration 
My Vfet in a 4u case with Antek AS4222 and single peter daniel power supply board. Capacitors are 50 volt. There is probably 2 inches of usable space in between the power supply, vfets, and the top panel:
https://1drv.ms/i/s!AtUqSzQhRd9Xgb5YO18IFBuW23dcPQ
Should have added: The transformer goes right up to the edge of the PCB, probably 3/4" away, and the 50 volt capacitors are the tallest things in there. They are taller than the front end heat sinks on the pcb's
My Vfet in a 4u case with Antek AS4222 and single peter daniel power supply board. Capacitors are 50 volt. There is probably 2 inches of usable space in between the power supply, vfets, and the top panel:
https://1drv.ms/i/s!AtUqSzQhRd9Xgb5YO18IFBuW23dcPQ
Should have added: The transformer goes right up to the edge of the PCB, probably 3/4" away, and the 50 volt capacitors are the tallest things in there. They are taller than the front end heat sinks on the pcb's
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