| the easiest way would be to get the appropriate thickness of styrene card you need. work out how large you need the box to be.
first of all score the shape into the card. do it as if you were making a cube from a piece of cardboard. also score the fold lines. then cut out the main shape and fold allong the score lines to make the cube and glue togeather.
what aircraft are you making the boxes for? if it is 1/48 i actualy have some p/e boxes for wheel bays if you would like them pm me your address and i will send it to you. |