After looking over the chassis above and the design used for the 6L6/KT66 version, I will not build it into this chassis. We will stick with the PPE EL84.
I will start on a new, larger chassis that will be able to run EL34, 6L6, KT66, 6550, KT88 tubes. This requires a larger chassis to be able to house the larger, choke input power supply used in this model. I like the choke input design as it allows the use of one of my favorite rectifiers, the 274B by Sophia Electric.
I am going to build a more standard 'vintage' style chassis for this amp with wither cherry or some of the Birdseye Maple I have.