Not sure what your budget is, but one option is to rebuild the front covered entry and have it span the entire width of the house, and consider repeating this basic form in future additions such as a garage if there isn't one already.

This is a similar home. Does the architect's response help you? "Yes the soffit is painted ( Resene Bokara ) to make it similar to the cladding. We did it this way in order to emphasis the sculptural form of the house - if it was white it would have broken up the form somewhat. I think it depends on what you want to achieve, if the line of the joinery is at ceiling level then it is good to have the ceiling and the soffit the same colour in terms of how you experience the interior space. If the exterior look is more important then the dark soffit would probably work better."

No your roof can't support that weight, it's designed to hold the weight of shingles only. You will need to contact a structural engineer to come up with a plan to support the additional load.

Pictures would help...are you planning on getting a new roof or is it staying? If it's staying, is it tile, shingle, metal? And what region is it located?