A thing that I don't like is the cargo bay so far back. Seems that you haven't left enough space in the aft compartment for fuel tanks and all the equipments related to the propulsion. Also, I think that the cargo bay should be centered in order to not modify excessively the balance of the spacecraft when full/empty.
Only a feeling... sorry for the criticism.
Don't be sorry for any criticism
There are some differences of configuration from the Space Shuttle, that compensate the problems you've described. Space Shuttle's payload needs to be centered, because it's maximum mass is relatively large in comparison to the rest of the shuttle. Corvus payload bay is relatively shallow, but it can take only maximum of 2500kg of payload. That's not very much in consideration to mass of the rest of the shuttle (17 tons incl. fuel) and in consideration to payload bay dimensions: ( roughly: length 5.8m, front width 2m, rear width 3m, front height 1.5m, rear heigth 2m.), The shuttle fits well for deplyoing rather lightweight, yet relatively expansive payloads.
The next thing is, that the rear part is limited to engines, some fuel lines, two RCS clusters, radiators and a braking chute casing. Two tons of fuel are located right below the rear end of payload bay (behind main landing gears).
Here's a quick look inside, that i made up in five minutes
The green part is crew's compartment, the blue represents the payload bay. The red represents the instrumentation or life support systems, the yellow represents the fuel tanks section, and the purple stands for engine and parachute compartment.