Now from my logic, as an anti-armor trooper you're generally not going to be on the front lines very often, so the goal should be to fit yourself as a glass cannon. Also I wanted to be able to carry around my own ammo so I chose to work with Swarm Launchers instead of Forge Guns. The first thing I did is start myself off as a Sentinel since you get Weaponry at Level 3 and Swarm Launchers at Level 1 to begin with. It also gives you Dire Sentinel Starter Fit which is a pretty convenient and non-consumable anti-armor fit. From there I was instantly able to upgrade Weaponry to Level 5 and Swarm Launchers to Level 3. This gives me a passive 10% weapon damage boost along with access to the advanced CBR7 Swarm Launcher which fires 5 rockets at a time instead of 4 on the standard and militia variants. That covers all the base Skill Points.
Time to get working on a fitting. With no dropsuit skills I have to choose from one of the militia fittings. Heavy is ruled out since it has no equipment slots and Logi is rules out since it has no side-arm, and between Scout and Assault the Assault has more CPU/PG so that's the winner. Of course using the militia fitting you are going to be tight for space, especially with the advance swarm launcher. Using a standard variant of a sidearm will consume considerably less space than the militia so had to decide which one I wanted to upgrade to level 1. Played a few rounds with both and while the SMG does give you an option to pull up and be a front line soldier if needed, as a glass cannon it is not very handy so I went with the longer range scrambler pistol and decided to simply run to a supply depot if I need to go on the assault.
As for modules I went with a light weapon damage modifier and armor repair. I originally had armor plates but quickly realized my main threat is the sniper, so it's better to have less armor that repairs itself than more armor that doesn't. Get sniped once and lose a bit of armor, wait for shields to recharge, get sniped again lose even more armor, wait for shield to recharge, etc. Soon you'll have next to no armor and the next sniper bullet to hit you will be your last, so armor repairers is a must.
Now I am extremely pressed on space. For grenades I wanted AV grenades but there was no more room on my suit; however, flux grenades did fit so I went with that. This actually turned out to work better for me since it can take down vehicle shields plus be used against infantry as well which AV grenades can't, so it's a bit more practical.
And that's where I am now. My mods, equipment, and sidearms are all either STD or MLT to compensate for the lack of space. Yes I know I should probably work towards upgrading my assault suit but I am Gallente so I'll wait for the Gallente version which should be in the next update instead dirty Caldari suit