Choosing mudguards for carrying a bicycle in a small lift I am in need for mudguards for a bicycle I bought.

Here is a link to the bicycle's description: Speeder i8 The bike is a flatbar road bike, with an internal hub and roller brakes. 

The bicycle is always carried in a small lift where it is positioned vertically on its rear wheel because of space limitations.

The mudguards I see in stores that would fit this bicycle have a problem: they are of "full length" and cover the wheel part that touches ground when positioned vertically.

What I need is something like these shorter fenders.
However, most fenders sold are larger, like these.

Are there any pre-made solutions?
You could try something with slightly less coverage like the sks raceblades. However, the sks commuter fenders have less clearance in the back. It still might be too much though.  Clip on fenders like the portland design work soda pop fenders may be an option for you as well, but they provide less coverage overall.

Fenders are one of those things that are pretty easy to hack yourself if you have some small tools.  I trim off some material from the fender to make it fit.  

I would bolt it on to the fender mounts on your rear dropouts and then measure the distance from the actual end of the fender to where you would like the fender to end. Then, on the other side of the fender, where you secure it near the cranks, I would mark the fender and trim that much material off from the end.  You could do this with a coping saw or a dremel tool pretty easily on plastic fenders. You'll need to re-drill a mounting hole.  

You might not be able to trim the fender in a straight line, you may have to cut it in a similar pattern to the bottom of the existing fender, depending on the fender's width. Skinny fenders may need little to no tapering at the bottom, while large fenders may need to be thinned down a lot. Really, just make it look like the end you're chopping off and it should be fine.  You could trace the shape on to some paper, cut it out, and trace that on the fender before making your cuts.

You might also want to put some washers on either side of the new hole for extra reinforcement.