Ok, today at work I have brainstorm about Earth-Mars-Earth. Point one I need 6 stages with landing and command module. Point two I must reduce weight to minimum so for that six stages. And command module will have two or four at start empty ejecting Collector tanks(Tm)- if stages 3,4 will have unused fuel, I tranfer it to Collector tanks(Tm) and use it later. And before entry to low atmo I eject them to lighten spacecraft. Then detach fuel tank with engine, deploy chute and land, so this is plan. But BOT. I edited dimenssions of stages as too close of Blazers info as possible