HI Jason and welcome to the forum.
That's a LOT of preamps It might be a good idea to start with just one and build up from there.
If you have all four channels how do you plan to configure the inputs as they could be driving more than one channel? Paralleling things up will affect the tone unless you take steps to mitigate it. Are these going to be switched or all running in parallel? Potentially, that's lot of front panel controls. With careful thought you may be able to use switching to vary between the topologies and save on real estate and cost.
Have you taken a look at the schematics yet? There is not much difference between the Deluxe Reverb and the Twin Reverb so you might want to choose another. Also both have four inputs - you might not want that many.
There will be gain differences but if you can put an appropriate gain correction on each output as necessary without too much difficulty. Since tubes can easily output tens of volts that will instantly destroy opamps you will need to think about the signal levels and take steps to protect the SS devices.
What do you plan to use for the power amp?