Well, Twin Otter time is good to have if you like to fly for Seaborne. I got hired there after Flight instructing for two years. I sent my resume to STX every month for around a year and half, got the call on a friday and started groundschool on a monday.
They have hired SIC's with NO Twin Otter time and no float time. Of course having both is great but there are just not enough float people around.
Again if you like to work for seaborne than go down to the islands, hang around for a while or even get a job waiting tables or work at the ramp at seaborne. I knew one guy who had I think less than 1000 hours, started at the ramp and started groundschool as SIC in less than 3 month.
There is still a girl flying for seaborne who used to fly for senic.
Have fun