My source
What I did was to go to the local Joann Fabric store and inquire whther they knew of any local seamstress who would take on this project. After I contacted her, I made some measurements and then went to any bedding store to obtain the necessary flat sheets to make up the fitted sheets. I also had her custom cut the fitted sheets as well. Concurrently, I also had matching pilow cases availible. For the V-berth and rear berth of my 89 30g, she only wanted to charge me $50 for the labor. For the quality of the work she did I ended up giving her $75. The fitted sheets had elastic cord put in them as well. I did leave the cushions with her so she could custom fit everything. I did this in the spring and I believe it took her all of 10 days to complete. finally, I had her make fitted sheets for each of the pieces making up the v-berth and rear berth components. That way, if I needed to get into a storage compartment I would not have to disassemble the entire bedding. Good Luck.