Spare time has been in short supply these last couple of months, but I found some this weekend and was able to work on the cab.
At some point since my last update, I settled on Infinicade as a name. My wife likes it, and it grew on me, as well. So I went ahead and ordered an all-red lightning design from Scott at Mame Marquees. I got the completed marquee in about a week and a half, and it’s exactly what I wanted (the red even matches perfectly with the red t-molding and buttons).

Highest possible recommendation for Scott and his products!
So, this weekend I went to work on the marquee assembly. I picked up some plexiglass at Home Depot and measured it up. Following the technique most others have used, I scored it with a plexiglass cutting tool, clamped it down, then broke it cleanly along the lines:

It turned out great, with nice clean edges.
Next came the retainers. I wasn’t wild about the Happ marquee retainers, so I decided to make my own. Since I was short on space on the speaker shelf (the speaker grilles will take up several inches), the bottom retainer couldn’t be very wide. I picked up some angled aluminum at Home Depot:

Drilled the holes:

Primed and painted it:

And then realized that it wouldn’t work. Because of the angled speaker shelf, the bottom retainer has to bend out about 15 degrees. Try as I might, I couldn’t get the aluminum to bend. Plus, the aluminum wasn’t quite wide enough to be able to screw it into the speaker shelf far enough from the edge to take hold.
Luckily, I also bought some plastic corner guard, which WILL bend enough to allow that 15 degree angle:

I drilled the holes again, then primed and painted:

Once painted, they looked great, honestly, probably even better than the aluminum. After they dried, I took them inside to install on the cab. I screwed the bottom one onto the speaker shelf, then slid the marquee in:

Then I screwed the top retainer into the top of the cab:

Here it is lit up (with the custom XP boot screen):

And the cab as it now looks:

Crossing the marquee off the list, that leaves installing the monitor glass, the speaker grilles, and the button labels. I’m still deciding how dark of a tint I want for the glass, though. The Greylite 14 is what I’m leaning towards, but I wish I could find someone in town who has some scraps that I could use to test before I buy the whole sheet.