I'm also interested in where to purchase a spring mattress for the quarterberth. I didn't see a response to Greg's request for info about this.
Thanks. Kate Mullins, Impulse; 35'Mk I

1. HMC Handcraft mattress co. 1800 Broadway #101
San Francisco, Ca 94109 800-241-7751
2. Community mattress Co. 1811 Broadway
Concord, Ca. 94520 800-404-4114

Both of these companies specialize in boat mattresses in any shape or size and build foam or box spring types.