onesight1, CONGRATULATIONS on your new home! At age 21 to boot, your family should be proud of your accomplishments. Speaking of your family, the fact that you Skype with your dad is great; the fact that you two use it to confer about your house projects is just fantastic! What a great use of technology. Your dad is probably busting with pride over your progress (under his tutelage, of course - lol).
In regard to your ceiling, I know it gets pretty frosty in 'Dreary Erie', but adding 5/8" sheet rock to the ceiling and blown-in insulation on top of the vapor barrier will make a HUGE difference in the winter's shop temperature, unless you work with the garage door in the open position - ha! Even without a heater, you will appreciate warmer temperatures out there. Get a buddy to help feed the insulation hopper and get to it; it could be a weekend job that pays big dividends in the coming months.
Nice job on the roller cart. Does the top surface height match that of the workbench? Having them at equal height makes for a convenient expansion table for large/cumbersome workpieces.
Again, KUDOS to you!