As long as the wings are separate submodel, they can be made to move using the animation code. You can either set it up so that they're moved by the FREDder making the mission, or you can link it to things that happen in mission, like firing the weapons or using the afterburner. Those probably aren't quite right for a Firespray though - you likely either want them to be just shifted manually (since they'll spend 99% of their time horizontal) or link them to the engines being in use.
That is a tiny bit trickier, because you'll need to use a lua script, but it's already written, so it's essentially just a matter of using one extra file and changing the ship it references to the Firespray. Grab my GTFg Jupiter and use the -sct.tbm included as your base (or just leave it for FREDders, as above ). NB, if you do use it, credit Xenocartographer for the script, not me.
thank You for the suggestions! i thought about it, You were right: the wings are most of the time in flying (horizontal) position, and only moved to vertical when landing and docking. i guess, one can link it to the docking function too, since there is really no landing scenario in space...
it would not make much sense to let the player move the wings, but i think it would be cool to allow this - just for fun
i hope there are FREDers out there who will use it, because i do not know anything about FRED.... if i decide to use the script, i will give credit. also, if someone would like to use this model, please contact me. as with my other models, this one is also free to use.