Download the LDRAW instruction files for:
Galileo Shuttle Booster Engines
These instuctions are not the greatest in the world. The body is really just a level by level map of the blocks used. I used clear colors for plates, and solids for blocks. The list at the end of the file is the part list and count. The list is Ldraw part number, description, and count. You should have a solid body by the 5th step.
The engines then connect on the underside of the wings, butted up against the 2xn plates. If you don't have 16 part 376 bricks, you can cut down on the number of supports, just replace them with the equivalent number of 2x2 round plates.
You may want to use -s0.5 on your Ldraw command line, as the model is quite large. The engines will run off the page. It's up to the builder to add seats and a door. I used a right hand door from the freestyle 650 pc bucket.
You will also need ( and should have) J.Jessiman's LDRAW program.