This looks like an interesting project!
The overall size and shape reminds me of Lockheed Martins Mars Ascend Descend Vehicle (MADV):
The MADV was a single-stage to surface and back to orbit concept, using Hydrogen and and Oxygen as fuel.
Estimated figures of the MADV were:
Height 24 m, width at base 6.5 m.
Dry mass 22 ton + 1 ton crew and payload, fuel mass 70 ton.
Engines: 6 x RL-10 = 660 kN thrust, delta V = 6.3 km/s.
Maybe you could give the main dimensions of your model, so we could estimate the specs.