I think its good for sketch up. 
Indeed! But that's not quite what I had in mid. And in all fairness, I don't think that's up to VSTEP standards either.
I hate to sound nasty and disappointing, Captain Titanic. I do sincerely appreciate your time and effort in responding to my request. But having worked as a 3rd party designer in the Flight Simulator community since 1995, I am a really picky
*******. I know it and everybody who's ever worked with me on a project knows it.
Perhaps suggesting Sketchup as the main 3D software was the mistake in the first place. I don't know who suggested it, and I don't really care. It's a brilliant software for "enthusiasts," but you, as an advanced model designer, have to agree with me that it stands no chance when you compare it with proper 3d design packages such as LightWave 3D, 3D Studio Max, Gmax, etc.
I have no idea if you have any experience in 3rd party design for games, but I can tell you this: it's an exhausting team work that requires hours and hours of modeling, mapping, animating, texturing, beta testing and so on. [un]fortunately, it's up to VSTEP to finish the second important half of the design process which is the dynamics design. But still, in general, this is a time consuming process.
Again, I'm a truly sorry for bringing up all the negatives. The thing is that since SDK was dropped (http://www.shipsim.com/ShipSimForum/index.php/topic,1071.0.html), the only option to convert models into the game is by asking VSTEP. It's either that or no other option. And since there are reasonable limits, and also because I'm a picky
*******, I'd rather VSTEP spend its resources on converting top quality designs (http://www.shipsim.com/ShipSimForum/index.php/topic,3702.0.html). But that's just my opinion. And I am only a user of this game. I can't find the original SDK discussion on the forum, but I was one of the ones in support of an open community. Something similar to the huge Flight Simulator community which I am familiar with. Anyway, that discussion is over now. I just wanted to let you know that it's very unlikely that VSTEP will accept sketchups. Have a look at their guidelines (http://www.shipsim.com/ShipSimForum/index.php?action=dlattach;topic=1071.0;attach=1622). If you think I'm wrong, forget about everything I said and please accept my apology!
Edited for language, DJM.