There are plenty of people who really know what they are talking about. :D
DON'T WORRY, I AM HERE.
It's probably not trinitieinning because the weapons aren't long enough (centrifical force yadda yadda), but you know, it really doesn't need to. That's not a trinity design - if you wanna go full trinity, you'd probably just make the extenders go straight out from the pistons and make all the weapons face one way, kinda like this:

(Note though, I'm pretty sure you only need the smallest piston to trinity, saves weight)
The way you've got your weapons right now is more rammer-style than SnS (SitNSpinner).
Good job on the drive (great motors and wheels, those things are grippy, but it could use 3 or 4 motors for insane speed) and weapon placement, just pretty much rotate the weapon "bar" 90 degrees is all. Or you could go with hammers if you wanna spice things up.
Some specific tips for this bot:
Nice basic design. But on GTM, that chassis is like the Titanic. My best SnS (it's not a trinity, but who cares) uses about a 2x2 chassis on the grid. I attached everything I could externally and armored it up. Not saying you need a chassis so small, but the more weight you save on that, the more you could give to weapons or drive, etc. It only had 240KG of weapons but insane drive and the axles themselves almost trinitied.
But enough about that, this thing could be improved a lot if you took that advice. But all in all, it's not bad for one of your first bots. You might just try messing around with a minute chassis with everything possible external, then protecting the pistons' microscopic HP with some skirts or something. Might try jamming more Eteks on too. Or ditch the trinity approach and just do a basic or TOFU style SnS.
By the way, ant batts are the best and always try to use Multiextenders (MEs) instead of baseplate anchors.
Some of the best wheels are vlad, hypnos and technos.
I think Plastic 5 + 3 and tite 1 are the most efficient armors, but I don't remember. It's not too big of a deal, just try to avoid really heavy armor if you can, weight will usually be best used elsewhere. Especially if you have dinky chassiseseses like me... bwahaha