ichbins

Hi,I've played Ufo a lot when I was a kid but never played it through... now I'm playing it again (dos version) and it's still great I have a question that I couldn't find definitely answered here after a short search. I've started the campaign and have built a storage base. I'd like to keep that base undefended (= no soldiers or tanks there). Is it possible to defend the base only with facilities without giving the aliens any chance to conquer the base? Currently there are 4 fusion ball defences and 1 mind shield in construction, one grav shield would follow as soon as it is avaiable. Would that work? Greetings ichbins