I am working out the final details on a gathered end hammock underquilt. I have sent one test model off for evaluation. I tested it here on a Speer and a Claytor Jungle Hammock and it worked pretty well. The good news is the cost will be $120 for the regular (up to 6' tall) and $130 for the tall (6'+), shipping is not included. The regular model weighed in right at 1 lb 14 ounces but actual weight will vary an ounce or 2 either way due to differences in the insulation.
I hope to have these on the website for ordering within 2 weeks.