The nightmare in my closet; what is your personal unfinished project, and why?

[Rbray47]

Amt Mack Cruiseliner and R685. I absolutely hate those Mack tandem rears. No matter what I do, I can't get them together. The Cruiseliner is the worst, since the rest of the kit is as horrible as the suspension. The R will eventually get built with a single Drive once I dig out some leaf springs that look right. But the Cruiseliner...not sure when or if it'll get finished. 

Plus, I have a 51 Fleetline full custom thats been going a long time. I started it shortly after buying the kit when it came out, and it's the "Millennial" boxing lol. Its finally in paint and on four wheels, but the interior hasn't even been started.