You can purchase (or you may already have) portable ironing boards with the traditional one inch grid on them. Use this by pinning strips going one direction at both top and bottom to hold the strips taut (for the warp) and weaving strips for the woof going in the other direction. In addition, if you place a sheet of lightweight fusible interfacing on the base before you start your weaving (glue side up, obviously) you can press your woven pattern in place once you've finished your design.