I'm finally making some progress.
I received the extrusions from Misumi to assemble the X & Y axes as well as the brackets, nuts, bolts, etc. I'm going to use the 30% discount to pay for the extrusions for the Z-table. It's quite large once it's sitting in front of you! The extrusions are all 70" long, the rails are 64".
Here's an interesting item... The heads of the socket-head cap screws that I ordered with the extrusions were too large in diameter to drop into the counterbores on the THK rails I'm using. I had to turn down the diameter of 42 screws on the lathe to mount the rails to the extrusions.
I also received my pulleys and belt from Stock Drive Products.
I've seen several posts about the problem of the Y-axis rods whipping at high speeds. I decided to use larger diameter aluminum tubing instead. Tubing is almost as stiff as a solid of the same diameter, only it's much lighter. So, instead of using 1/4" rod, I used 3/4" OD tubing and turned some ends on the lathe to fit my stepper couplers.
I finished setting up a dedicated PC for the cutter, installed Mach3 and added a touchscreen.
I ordered the LightObject lens holder as well as the associated mirror and lens.
The real pain is that McMaster isn't shipping my stepper couplers until the 15th.
Next to do is:
build the support table for the extrusions
build the idler and drive gear assemblies
turn the ends for the tubing-to-drive-gear assembly
get Geckodrive and steppers working with Mach3
mount the laser
build the cooling system
Plenty to do.