You can also have any local canvas company that is reputable build new curtains for you. We will be doing that this winter since ours didn't come with the drop curtains. We have had several other boats canvas made and been really happy with the results and then you can also customize any way you want. I will be adding zip out panels in the front so I can get the airflow on hot days but be able to zip it back closed as soon as the temps change. Our weather often goes from cold to hot to cold all in one fishing run.
Good luck and post some pics of what you decide to do. Always love looking at tother peoples ideas because sometimes it changes my ideas.