If you want to build or order a special adapter to mount your lens to different camera, there are few basic things to do.

The first and most important task is to learn flange focal distance of both the lens and the camera.

This will give you idea on how the lens will be positiond relatively to the camera (far from it, close to it, or even inside the camera).

If the lens needs to be placed inside the camera, you should compare lens mount diameter and camera mount diameter. If camera mount is smaller, the adapter is impossible.

Otherwise, you can start drawing your drafts.

Let's explain this based on Canon EOS camera with EF mount and KMZ RO56 lens with OCT-18 mount.

1. We can find info about Flange Focal Distance (FFD) of both mounts online. It is 57mm for OCT-18 mount and 44mm for Canon EF mount. The camera FFD is shorter than the lens FFD, and this is good start.

Designing adapter. Step 1.
     
2. Subtracting the camera FFD from the lens FFD we will get the necessary adapter length to preserve infinity focus of the lens. 57mm - 44mm = 13mm.  There is simplified adapter drawing on the photo above between the lens and the camera diagrams.

3. After we prepared models, let's try to combine the adapter and the camera.

Designing adapter. Step 2.

The adapter seems to fit the camera fine.

4. Now, let's try to combine the adapter and the lens.

Designing adapter. Step 3.

And success again! The adapter fits the lens.

5. Final step is to combine everything together:    

Designing adapter. Step 4.
     

And here is the failure and disappointment. The lens can not clear the camera interior. It hits the camera at least at three points, and will touch the camera electrical contacts as well, probably.

Actually, you could find this out much earlier by just doing a simple handheld test (holding the lens against the camera) to check if you can get focused image of distant objects without touching the camera by the lens. But this should be done with caution to not damage the lens glass or camera elements.

What can be done? Basically, nothing. Maybe the first thing you want to do is just to make a longer adapter to avoid collisions. This is possible, but you will NOT reach infinity focus then. The lens will focus to very close distances only, and most people don't need such a macro adapter.

Designing adapter. Step 5.Another possibility is to make the long adapter and to add a compensating lens in its rear part. But this is difficult to calculate and implement, and you will lose image quality introducing extra optics to the system.

The good news is that not every OCT-18 lens is so long at its rear part. Some lenses may fit this adapter on the camera, and that is why we made OCT-18 lens to Canon EOS (EF) camera adapter for zooms. But you know it's possible problems and limitations now. Zoom lenses with OCT-18 mount have no glass in the rear part, and can be used with such adapter.