[SPACE 4e] System Design help? (star systems that is...)

[Qoltar]

Alright I bought GURPS:SPACE 4/e and I am looking for a little bit of advice or at least someone to point me in the right direction.

For a player in my campaign I need to concoct a star system that has THREE planets within the life zone. Thats right 3 (!!) planets in some kind of tolerable and believable orbit bands and such ...all of them plausibly habitable for humans. And is VERY "okay" if one of the 3 turns out to be a mostly "Desert World" . I also own INTERSTELLER WARS ....but I figure might as well use the more detailed system.

Any advice on this? Should I just roll dice until I get "close" to what we want? Has someone already got parameters close to this in a Playtest exercise? (and please don't send me a link to a PYRAMID article - am not a subscriber....can't afford it ..YET)

So, any planetary system designing versions of "Gearheads" out there...That can give me some tips or suggestions?

- Edmund W. Charlton