Why Reinvent The Wheel?
In the mid 70's Dyson bought a Hoover Junior vacuum cleaner and was disappointed by the "loss of suction". Rather than perfect or find a work around for that issue, he went through thousands of prototypes to replace it.
Obviously, if the Hoover was that bad, it wouldn't still exist in the form of the direct air vacuums still on the market today.
My suggestion would be to perfect and re-brand one of those. Replace the plastic housing with metal, improve the light, improve or replace the belt with something stronger. Quiet the motor and/ or fan, make the height adjustment easier. Possibly just retrofit existing parts with improved ones.