Looking forward to the progress on this. I've got something big planned as well, but not quite this big. If you can make it to RTX I might try to come out for it too.
UPDATE
A minor one be it that, but got around to finally sealing the back half of the tank. By sealing I mean I've closed all the gaps so no critters or bugs can get into the inside of the tank. I have a few more panels and boards left to do for the front half before it too is sealed, then I can focus on water sealing and painting the outside. Going to order 2 gallons worth of Block Filler Primer this week and have it delivered to Home Depot so I can do that next weekend.
Also, I painted the back interior both red and blue (For Red VS Blue of course) and added carpet on the inside for more comfort. I plan to work on it weeknights again just so I can get it sealed and out of the garage, because Winter is coming and I need room to work on the treads over the Winter months.
Sorry I haven't been posting updates. Due to weather I've put Sheila under tarp until the warmer weather rolls back around in March-April. Next I'll be working on the treads when the sun comes back.