Paul, there are several options available to you if ya want to get yourself a 1:144
747 SP.
As mentioned by Ray, in the March 1994 edition of
Fine Scale Modeller magazine, a comprehensive article on converting a 1:144 Revell
747-100/200 into a
Boeing 747 was published. I have you covered on this, (indeed I have already printed you a copy), but here is the article for your to ponder:
Your 2nd option is to try and track down the old, (and long OOP),
Sasquatch 747 SP resin conversion fuselage for the Airfix 1:144
747-100/200.
The reason the Airfix kit is good for this conversion is that you can use the wings virtually unmodified from the box, as the prominent trailing edge flap canoe fairings, (which are NOT a feature of the
SP), are not cast into/onto the wing. If you really want to get technical though, you will need to bog and re-scribe the trailing edge flap arrangement, as the flap design on the
SP was different, (and much simpler....basically a scaled-up
707 flap arrangement), to that of the "standard"
747. Your will also need to get yourself a ship-set of short-body
RR RB211s.
Your other option is to simply order a 1:144 Qantas
747 SP from Welsh Models.
Hope that helps
TOR