There are many paths this project could take in the future. We might be able to take the take the relationship between engine efficiencies and the fuel and find the payload capacities of each. One might include comparing the efficiency of solid rocket propellants to liquid propellants, or add boosters. One could also find costs for the items and for better engines, and calculate the least expensive change with the most efficient engine. Another possibility would be to find the rocket structure (shape). The number of stages could be varied, and the optimal variation recorded. Rocket science has many opportunities in today's world. We have but touched on the idea. Reaching Earth's orbit is not the limit for the future!