When I searched for "Thailand Hammocks", there were several sites. In that country, to have something sewn, you would just need a diagram to show to the seamstress.
I'm confused as to why you would want to buy something manufactured elsewhere, unless it had to do with thread strength. In some countries, having merchandise shipped in, has problems with duties if the product is in competition with local products. Good luck on your bike trips.
As already mentioned, the Dream Hammock Darien Ultralight was designed for Panama, which has similar climate and bugs to Thailand.