I have already sold a number of Toolbox 3's, and this, in a sense, does much the same thing. It allows you to create spaceships. Now Toolbox 4 does it in a different way - an old school, math-heavy, system by system and subsystem by subsystem way, where Toolbox 3 was choose from these hulls - choose from these options - add stuff up - done.
So, I should have named Toolbox 3 "Quick and Dirty Starships"! I got that! Too late now! Anyway, if you bought Toolbox 3 and were wanting something more like Toolbox 4, let me know by PM. I will send you the pdf for Toolbox 4 gratis. Anyway, here's the blurb:
StarCluster 4 Toolbox 4 is a tool designed to let you create and control every system and subsystem of the starships and stations for your StarCluster 4 Game. Unlike Toolbox 3, Toolbox 4 is math heavy and incredibly detailed, but yoou can do whatever you want, at the price of detailed calculations. You can create:
Tech Level 7, 8, 9 and 10 ships - not just TL 10
Arbitrary sized ships - not limited to certain hull sizes
Armed military ships - not limited to just unarmed civilian ships
Matter-Antimatter Drives - for enormous power
Atomic space drives like Orion and Nerva types