Finally started my entry a couple days ago. You can follow my build notes as I post them to my facebook page but here is what I have so far:
This is of course 100% scratch built using styrene, cardboard, pvc fittings and other misc. greeblies. The only toy parts I will wind up using are 2 star wars missile launchers (used as engine details), A 1:12 scale motorcycle seat and handlebars, and one Gi-Joe BMF missile launcher gun for the wing missile launcher (Going to have the same play features as the original toy!
I know it's not 100% accurate with the original toy, but I'm taking some constructive liberties as I am basically making this up as I go and eye-balling each part. I'm using mostly hot glue to hold it all together, as well as super glue in some joints, so I am hoping it holds steady through to the painting process (It should, this is the same technique I used when I constructed the Pre-Viszla mando speeder bike).
If you are on facebook, go to like this gallery to be notified in real time as I upload progress photos as well as see the build progress from the very beginning!
https://www.facebook.com/media/set/?set=a.892405697465107.1073741887.275038512535165&type=1&l=b34547f987