http://www.goldhawkinteractive.com/forums/forumdisplay.php/9-Release-Announcements
They release a shit-ton of updates in a very short period of time. Are you perhaps not using the experimental branch?
Engineers don't make money well, like at all. You always use alien resources to craft stuff anyway, so I wouldn't recommend it.
About the defense question, most soldiers will defend the base. I haven't seen any limit.
Hey, he saved the base a bunch of times and is a freaking genius (designing aircraft in a few hours like it's nothing), so I can kinda forgive his bad attitude. But yeah, I would love to know if Chris based him on someone he knows.
I had that problem. It was caused by the mod being outdated and not in sync with the new version of Xenonauts. Try downloading the latest version and see if it happens again (if you haven't already).
Sorry for the bump, but I totally forgot to mention this.
I'm also using the optional patches for the doors. The file Open Doors - Exterior actually contains two folders: Exterior & Interior. The file Open Doors - Interior contains only one folder: Interior. Since there are 2 Interior parts and they overwrite the same files, I only installed the Exterior part of the file Open Doors - Exterior and the Interior part of the file Open Doors - Interior.
Perhaps it's somehow related?