Tamiya has an excellent 1/100 shuttle kit.
The 747-100 is the variant that carries the shuttle. It has a wingspan of 195 feet and a fuselage length of 230 feet. Hopefully that helps in determining the scale.
I'm planning to also build a shuttle + 747 combo in the near future, but at 1/200 scale.
1/32 Revell Duo Discus
1/32 Revell ASK-21
1/48 Ardpol SZD-51 Junior
1/144 FineMolds Millennium Falcon
1/48 Czech Models Grumman Goose
I have never heard of it but I'm a ww2 junkie so I'm not surprised. I'm interested to see whats up with it though.
ON THE BENCH: 1/72 Fujimi Ju87G-1, 1/72 Hobby Boss Fw190D-9, 1/48 Hasegawa Bf109G-2, 1/48 Dragon Ju 88G-6
I thank it is the same kit I had back in the 80s that was released by Entex. If so it is a great model kit and is 1/100 scale. Tamiya makes a Shuttle that scale but I am not sure it is readily available.