To me, your location does give economy as highest priority. So, as long & thin hulls as you can get - 34' isn't much really, and you wont be able to carry much load at all without sacrificing performance. Two couples plus stuff could load it so that it becomes a bit of a dog. Going longer means a bit extra hull
width, extra load capacity but you can still have good speed with low fuel consumption
or even high-thrust outboards could work for you and be much more simple for maintenance
You will want to keep it light as possible, so good points about no a/c etc. But I'd suggest you avoid the flybridge. Sure, its nice up there but they create a lot of windage, which will cost you a lot of economy. And it tends to cascade - you opt for a flybridge, then want a bimini
to be in the shade, then want some clears to keep out of the rain in squalls.....
A couple of sites worth looking at are Malcolm Tennant Multihull Design Ltd - Scimitar 11.5
and Maine Cat P-47 Overview
The latter is for a lot bigger boat, and has lots of equipment/systems, but both sites walk through the "Tennant canoe stern" efficiency story
I think the only way you'll get 2 x queen berths is to have them on the bridgedeck, accessed from the narrow hulls which will be mostly a passageway with limited storage
, and head
With a big cockpit
area (with a soft top), and some of the front windows being able to hinge up to open, you will have good shaded and well ventilated area to chill out.
Is such a beast available commercially in your budget
range? Not sure, but I suspect you might have to build, or get a build completed. Like Catman, or Masalai (boatdesign.net)