My son and I completed our bricklink'd Super Star Destroyer. Love the build, and the size is pretty impressive. If I had one gripe, it's that the mini-figs cannot stand up in the faux-bridge they included. To pose them, you have to leave the cover off. To store them in there, they all have to be either sitting or laying down.
I substituted a handful of internal parts due to cost, like the yellow right-angle brackets that cost around $5 each.
Total cost was under $400 spread out over a few months (to avoid the wife radar), but we still need to buy 2 of the 5 mini-figs. The exercise of finding the parts, maximizing the orders, inventorying and sorting, and then finally building, was a VERY worthwhile and fun project. Almost like an archaeological dig of sorts.