My brother and I manufacture our own photo pcbs and it is not as difficult as it may seem at first. You will need a saw, a UV lightbox to expose, some chemicals to develop & etch and finally a drillingmachine.
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Finally we join all four overheads together with self-adhesive tape. We cut the raw doublesided pcb a little bit to big and put doublesided self-adhesive tape on both sides of the pcb and place the pcb with two overheads on each side of the pcb. During the 2 x 7 minute exposure, we cover the pcb side turning up with black cardboard, and voila you have a doublesided pcb.