stitching a cover on a steering isnt that difficult even for a DIYer who knows some basics of stitching, I usually make a sample cover with tape and use that as a template to cut the hide and then decide how to stich it, there are many types of patterns to choose from. The most common being baseball stitch. The MB and BMW wheel stitch is european leather stitch which actually are two straight stitches cross linked by needle.
Find a piece of good hide, thread, wax, awl etc. get to work - its vital to repair the original rubber padding first, samad bond and a razor blade are best, Its also a good idea to cut the original material where the joint will bunch up. This provides a smooth finish. Dont bother with fake plastic leather as it will simply flake off in short time from skin oils, abrasion and skin shedding.
If people were redoing their MB wheels with fake plastic that looks like leather - then its not anything for praising a craftsman - its actually a stupid move by the owners who cannot afford the correct repair for their car.