Possible Inventions to Recreate

After the initial research i began to think about the possible inventions that i could recreate, i wanted something that would be challenging yet simple in design.

        
The Flying Machine 1- 1488                The Flying Machine 2

                         
Giant Crossbow                                   Parachute Drawing

These are the 4 options i came up with, i finally decided i was going to recreate the Parachute drawing as i think it will be relatively simple to recreate in 3D Max.