The strength of the lapstitchtm joint is such that the designs require comparatively little fiberglass or fillet work, making them especially easy to build. our. It is simple and inexpensive to fix holes in a pop-up camper. check this guide for tips on repairing holes in canvas tent trailer.. Built by peter randall – the total including engine, trailer and everything to get it going was about $17,000 australian. i’ve been quoted around $35,000.00 by.