I ran into a money shortage, I what I ended up doing was staggering my progression between two of three things, ship building, research or construction. I couldn't afford to do all three, but I could do to with very little loss or very little gain. I ended up completing the colony on mars, sending enough mineral to build a commercial space port, and finance center on Earth to /slowly/ bolster the econ, to the point where it would pay for one of the three money drainers.
I was killed off before I could see if this strat was going to work. It seem to be, I had to be careful with how many finance centers, as their build points could balloon costs.