There is no going rate. Most are not willing to pay at a commercial rate so your best bet is to find local builders who may be willing to do the job for a more palatible amount of cash or better yet trade in other airplanes, engines etc.

The trick is to find these folks and to pick which ones would do the best work for a reasonable consideration. Stay Local.

Other considerations are what you want fabrics, films and just how complicated you make the design. This can easily double or triple the time involved.

The very best solution is to start learning to cover now not later and on simpler airplanes rather than avoiding the job. After you get a number of airpanes under your belt then do your Baby. Everyones first full cover job, is well to be kind usually flyable. Every one will get better and sooner than you think your skills will blossum and you begin to look forward to every new cover job on new airplanes or old ones its the best part of a build or refurbishment.

John