Trusses let you make a span with much lighter materials and you can usually use less of them than standard rafter construction. I built my own to span a 24' workshop out of 2x4's using a W bracing and no center post like your design has. That design is surprisingly strong. Triangles work. They're the strongest shape known to man. Why do you think the pyramids are still standing? The trick is to make sure that neither rafter can exceed the maximum load at any point by connecting it to the bottom chord. Load rating on 3 feet of 2x4 is a lot more than it is on 10 feet. BUT, if you want 10 ONLY ways to build a truss, just ask 10 home builders or 10 truss manufacturers. There are LOTS of designs, meaning all you have to do is pick one that suits your needs. Looks like you did.
The nailing mesh you used will work fine, but I made gussets with 3/8" plywood and glued them as well as used screws for all the fasteners. I put nearly 1000 screws in those trusses. Each one had nearly 100 screws. Glued gussets guarantee ZERO wiggle in any joint. I only used 10 total trusses to do a 24x36 roof with a 3 pitch roof. They're set on 4 foot centers (along the 36 foot dimension) simply because they're phenomenally stronger than a 14 foot 2x6, and I didn't need a single post out in the floor. I don't have any problem with snow load here either, and certainly won't on the sheet metal roofing. I've got some photos of the trusses going up in here somewhere. They were only a little bit more complex than yours, but also spanned nearly 3 times the distance yours do. There is ZERO vertical flex in them, even with a tensile load on the bottom chords. You DO however want to connect them on the rafters with purlins or decking (didn't notice what you were using for roofing), and it won't hurt to run a 2x4 under the bottom chord to connect all of them together end to end. This prevents lateral distortion. I also put cross-bracing between the trusses to help them stay vertical under extreme loading (which is never gonna happen here).
I'm that guy that believes all fly swatters should be as well built as a 20 pound sledge hammer. You've hit that mark with your truss design on a structure that small.