Hello Ter. I would start with two cardboard boxes,one sliding into the open end of the other.Lens mounted on one end and glass back mounted on other end.Now slide the boxes in and out to focus,starting at 16 inches for infinity and backing out until an object at 15 feet is in focus ,.this should give you the measurements for your boxes. You can slide one 5x5 diameter (telescoping)wooden box inside a slightly larger one for focus . While focused at 15 feet (greatest distance between lens and grnd glass)tack a piece of cloth or leather,etc.over the joint between boxes to block light. Allow for movement in and out of the boxes.Mount a 1/4 -20 3-prong T-Nut for tripod on front box,,balance for heavy lens.Of course this will get more sophisticatedas it progresses. Good luck Ron anger
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