Adding Aircraft Scenery

Cheers all. I have been using Instant Scenery with FSX for awhile now and have created a bunch of heli bases with IS. I would now like to add some ground aircraft to the heli bases to add to the scenery. I haven't been able to do it yet with experimentation nor with a lot of time spent researching on line and reading in all the IS & SDK "help" files, tutorial files and forums. The problems I'm having are as follows:
When using Instant Scenery, the vehicles_aircraft library doesn't have any aircraft models I want to use for ground aircraft scenery.
The Instant Scenery Library Maker won't let me add aircraft from my simobjects...I keep getting the .mdl format not supported message.
I have all of the FSX SDK stuff installed and working, but none of the tools are letting me add aircraft from my simobjects folders to my scenery.
Is there a way to place any aircraft I have in my FSX simobjects into the scenery as a ground scenery object and if so, how is it done?
Many, Many Thanks in advance
Nigel
When using Instant Scenery, the vehicles_aircraft library doesn't have any aircraft models I want to use for ground aircraft scenery.
The Instant Scenery Library Maker won't let me add aircraft from my simobjects...I keep getting the .mdl format not supported message.
I have all of the FSX SDK stuff installed and working, but none of the tools are letting me add aircraft from my simobjects folders to my scenery.
Is there a way to place any aircraft I have in my FSX simobjects into the scenery as a ground scenery object and if so, how is it done?
Many, Many Thanks in advance
Nigel