This is GSP Sky-High, it is tehnicaly my own design of the Virgin Galactic and it works.
GSP Postal Service is a strut reinforced 4 engine bomber which holds 2 bombs and can reach up to 360 m/s It is a bit back heavy and not so manuverable but it gets the job done and dosn't lose control. P.S. Activate RCS to open cargo bay for bombs.
Picture of the UBC Satellite in orbit