6 degrees of motion asked: What we disagree on is when smaller aircraft are on the approach (ILS autoland or manual on the glideslope) do you see two red and two white ALL the way down (Down to DH).
Yes. Providing the ILS GS and the vasis/papi are, as was said earlier harmonised. If they are and they should be, the only thing that changes is the height differences of the aircrafts parts over the threshold.
If the GP/vasi/papi were located 1000' from the threshold on a correct 3* glidepath, a 747-400s main gear will be 30' over the threshold, the ILS GP antenna 53' and the eye height 73' giving a 572' touchdown distance from the threshold.
Which is a bit close so most airports that have 747 movements have 3 sets of vasis and the ILS GP and papis further from the threshold.
If the GP/vasis/papis are not harmonised then get out the graph paper and start plotting. Personally I just aim at the 1500' point marker.