Modular Hybrid Reusable Rocket

Making rockets single use only may not be that eco-friendly and cheap. Therefore, I am updating my proposal. My new proposal is a modular hybrid design. Every stage is reusable. Depending on the mission, the stages are formed by combining the solid ascent boosters, solid descent boosters and a liquid propulsion rocket. 

I explain it on an example. First stage has 6 heavy solid ascent boosters + 2 small solid descent boosters and a small liquid propulsion rocket. Second stage has 2 heavy solid ascent boosters + 1 small solid descent booster and a small liquid propulsion rocket. and so on.

Initially 4 of the heavy boosters are fired to give 100% of the ascent thrust. Once they are depleted the remaining 2 of the heavy boosters are fired. Once they are depleted the first stage is released. The stage starts falling and at calculated point the solid descent boosters are fired to slow down the rocket. Once they are depleted the liquid propulsion rocket fires and grounds the first stage safely on the platform. Same process repeats for the second stage. Small solid boosters effectively slow down the stage. A fully loaded liquid propulsion rocket would then maneuvers the whole stage for safe landing. As a result, rockets are only fired once. There is no start and stop in any one of the rockets. This may simplify some of the problems.

Depending on the mission the configuration can be changed.