Help estimating altitude without altimeter?

Anyone try using the wing vs. runway relationship? In the Skyhawk I
was taught to keep the runway 1/2 to 2/3 up the strut, correcting for
wind. I know that this would lead to flying an ever closer pattern as
you descend, but could it not be used to get you in the groove up to
abeam the touchdown point? Then it would be a matter of TLAR from
there to touchdown.

I offer this as a question, not a suggestion. I've done very little
flying away from the home field, and I live in a very flat state.

This is sort of how I ultimately did it... when my aimpoint was at 9
o'clock, it appeared about 1/3 of the way down from the wing tip, just
under the air brake. This was about 800'.

-tom