I'm having some trouble with that math Static.
Imagine a 180 degree turn onto final from 3000 ft abeam as suggested, with no base leg. The total length of the turn arc is 4700 ft, which takes a grand total of 35 seconds at 80 knots.
You seem to be suggesting taking 20 to 25 seconds for the turn on to base and then another 35 to 40 seconds straight on the base leg. This would surely put you at least half a mile on the far side of the centreline, wouldn't it?
Ignoring this ugly civil convention of rolling the wings level for a while on base
and assuming the 180 degree turn on to final once again, you would have (assuming your 10 knot wind) about 5500 track feet to the touchdown point from the midpoint of the turn, and about 3200 ft track feet to the touchdown point from the end of the turn after the roll out on to final. The 3 degree glideslope heights for those are 275 ft and 160 ft. You can add 50 ft to those by considering the threshold rather than the touchdown point if you prefer.
That doesn't seem to be consistent with your "Hasn't your instructor told you to try to roll out on final at 450-500 feet?" when you cannot hope to be wings level on final higher than 210 ft.