Daniel, beautiful model. I think you'll find that a lot of fellow model railroaders have similar multi-year and/or multi-decade projects. I'm sure a lot of them get so discouraged by not getting a large project finished that they eventually bow out of the hobby altogether. I know I have several that are lingering into the 5 year area but I figure....eventually.
Which segways into my "flipped expectation" story. I wanted to build a rock train that utilized Greenville rock hoppers among others. The closest thing at the time were the old Atlas peaked end 2-bays, so I figured why not, they'll give the general idea until something better comes along. So I started buying them at trains shows for $2-3 each and had about 7 of them that I had done nothing with, when I came across a lot of 8 that gave me 15. Game on! So I started working on them. A few from the lot had heavily glued in ballast loads (actually completely full of ballast and BB's) so I had to clean all that out, the strip the paint off them, then file off the peaked ends. (all of those three items were a PROCESS...lemme tell ya) Then I filed off the heavy stirrups to replace with BLMA....things were progressing nicely! Ordered decals (some patched together) to build SP, MKT, UP, Golden West, and Gifford Hill varieties. Found close-to-correct paint in cans since apartment living won't allow a compressor. Rolling along! I was sure that I was gonna get these cars DONE....they were almost ready for the paint shop. Just finished up final sanding on the filed down peaks and was about to start drilling holes for stirrups when....BAM! Walthers announces.....Greenville hoppers.
But really...I wasn't too terribly bummed...I learned a lot about various methods of stripping paint, (seems the variations of the car from Atlas, Roco, et al all used different paint or at least application methods) and filing/sanding, and got a lot of decals I needed for other stuff too. Only thing is, I wish I'd picked another project during that time but like I said I might not have learned some new things.