I wouldn't have bothered with the log ornament as wood tends to mold quickly, and when (not if) your snake eventually eliminates on it, wood is almost impossible to clean and disinfect since it's porous.
I would also get another water dish. Your local dollar store's melamine cat dishes are fine, so you can just swap a dirty one with a clean one when your snake makes a mess in it (yes they do that), and put the dirty one in the dishwasher. Same with the hides, get a spare or two.
Just the UTH should be fine for heat with your ambient temps in the mid-upper 70's, especially if one of the hides is over the heat tape.