Pop up camper conversion

Hello all! I have lurked here for quite some time and finally ready to get something done. I have a older pop up i can use for my build. I also have a lighter 12 foot flat bed trailer.It may sound wierd but I would like to build a smaller hard side camper on the pop up trailer. The pop up is in decent shape just the canvas is shot like most. What I am curious about is if anybody can point me in the right direction so it dont look horrible. I have so many different ideas. My nieghbor is trying to talk me into buying a truck camper and mounting it on the trailer.(He knows where i can get one fairly cheap) I have alot of stuff already off a camper that i stripped down. Any help would be great! Thanks