A physics professor hands you a box that contains the following material: (mounted) lens A with cm, lens B with cm, lens C with mm and lens D with mm. There is also a piece of tubing 15 cm long that fits the lens mounts exactly and can be cut to any length you like with the enclosed hacksaw, a focus gear (that can be used to move the objective lens mount small distances along its axis in the tube), glue, screws, a slide/tube mounting bracket, and things like that.
Create a rough design in the space above for a simple microscope
with a magnification of using this material and equipment.
Clearly indicate the lenses you use and their arrangement in the tube.