That's why i said blimps are the way to go. Lifting body also has it's limit, at the end solar just can't provide enough thrust for heavy lifting, if the lifting it self is done through other means such as buoyancy then it's not an issue as solar can provide enough thrust for actually going forward as well as power the compressors to control the buoyancy of the craft.

Anything that will be dependent on aerodynamic lift alone literally won't be getting of the ground with any significant payload.