Sorry to be so slow to respond; internet is pretty sketchy here in Paradise.
*the $20 for the engine included a crane to remove the old engine & put in the new; rebuild/work over the V-drive & work to mate the existing transmission; repitch the prop to be compatible with the new engine RPMs, and etc.
*maintenance: we're feeling lucky so far to be under budget, but that budget includes the annual haulout & bottom paint. When we're back in the Chesapeake in the summer, it'll also include a diver periodically to get the slime off the bottom (yeah, even with new paint!) and, GRRRRR! at least one outboard carburator rebuild every year if we're in the land of ethanol gasoline.
*C-dad, I did too include the grill, under "miscellaneous items less than $1K each" the very last one. But it's been so chilly/windy that we've generally wanted the heat from the stove to warm the cabin, so we haven't used it much. Just traded a few 1-lb propane cylinders to another boat in exchange for some Kaliks.