I recently did a full cabinet repair/paint job on my Winner EM and it certainly is a lot of work.

The original paint was badly faded and marked with chips and scratches. The chipboard used as the backdoor on the headbox was puffed up and stuffed as was the back section of the cabinet (strangely the only two pieces on the cabinet made from chipboard??).

The pic below shows a before and after (the main cabinet is already done in that pic). It was worth the effort for me on this one but I certainly would give it a lot of thought before I did it again - it takes a lot of time and effort.