I still have my TRL modified DAC and battery powered solid state preamp. I sold the D-225 solid state amp to another TRL family member. It was actually Brian Weitzel's amp and it was in a huge wafer like black chassis. Not like the chassis they are using today. The preamp will eventually go back to be upgraded to Dude status.
Where do you live? If it's feasible and you are interested I might be able to lend you the DAC so you could get some idea of the sound. In addition to their standard mods, this DAC was further modified by removing the op amps and adding a capacitor coupled output. It is lower voltage than most digital gear so an active preamp like the Dude is required.
FWIW - the right set of wooden knobs would look great on that silver chassis.