Last month, I designed and printed a replacement tent pole tip for one of my Shepard's Hooks (see https://www.thingiverse.com/thing:2318607). Now I am working on a far more complex component. A few years ago, I bought a Furrion 30amp Power Inlet and 'Smart Cord' from the local Camping World (clearance sale in the off season - couldn't resist). The next year, while boondocking on our annual Man's Weekend campout (8-15 guys doing guy things - what could go wrong?), I started looking over installing this unit. Unfortunately I didn't get the conversion kit, just the power inlet. No easy way to mount it over the mouse entrance (especially 30 miles from the nearest town), so it sat in the cupboard until I had 'free time' to work on it. NOTE: The following text uses metric values. Readers that are sensitive to this or have small children in US public schools please be warned. This year, the Ductape over the mouse trap finally fell off. Time to get this thing mounted, even if I only use it while parked in my driveway (hence the lack of urgency). With the seemingly successful tent pole tip replacement, confidence is high. So far, I have spent the better part of this week designing a 3mm thick adapter plate, with screw holes and even a beveled edge. The idea is simple enough, make a ring ~21mm wide with screw holes and a square bump at the top for the hinge area. Except I have never used a cad program. EVER. Being a programmer, and an affinity towards Linux, I thought I would try OpenSCAD (http://www.openscad.org/). The 'fun' part of this is that instead of drawing an object like a circle or square, you describe it in a programmatic way (example: cylinder(3,d=117,d2=115) will create a cylinder 3mm high with a base of 117mm diameter and a top of 115 diameter for a nice beveled edge). The hard part is when you want to do things like screw holes in a set pattern (like the triangle pattern of the 3 holes to mount the original electrical hatch). You define a screw hole by subtracting (difference) a cylinder that is the diameter of the screw you want placed at the exact XYZ coordinates of the main object. I am just finishing my 4th (and hopefully final) test print in PLA (easier to work with and bio friendly) to see if all of the dimensions are correct. If it is good, I will do one full test print in ABS before making the final product. Will post pictures and links once it is finished and mounted.