Pablo - Looks great! I don't see any issues on my end, but not being very good with textures, that may not mean too much.
Columbia - Yep, had a brain lapse the other evening. I think I was trying to get multistages into scenario editor, forgetting that its sp3 that offers a work around to get them recognized, not multi.
Got a quick question for you. When researching the Altair, did it make any reference to the cockpit orientation? In your model, pilot faces main vector of thrust, so that when landed, he's facing skyward. I only ask because after much experimenting on lunar landing, such an orientation seems like a collosal pain in the keyster, not being able to see the ground and all!
Otherwise, a full lunar mission flies well, lift-off to splash-down, except for some difficulty in getting the Altair-ascent stage to not re-dock and try to drag the descent stage into orbit too. First lift-off, I'm cursing my 'puter, wondering why the h**l I wasn't building up velocity ... then I took an external look, lol. 10k up, pushing the descent stage right along for the ride!