i have in my mind to set this up as a speaker amp in the end, but that will be a while off.
i think your estimate of three hours was pretty good, for you. I think it was proabably closer to four for mortals like me.
With the tubes in, depending on how tall your spacers are, it will be near impossible to fit them in a 3 inch high case.
Ordered it from John Ango from ebay. Got it in just over a week. I've bought all my par-metal chassis from him. I think he manages the ebay front for Antek and Par metal. I have two more chassis just like the one in the picture sitting here