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You probably don't want to have a bridge exposed (See previous discussion about radiation shielding).
It would be better to place bridge between cargo storage and fuel tanks using both as additional protection. You can add cameras and maybe even observational modules on it's sides for biomorph crews (Synthmorps or infomorphs with drones won't need them). So a ring module with the bridge in the middle. It also seems way too big for this type of ship. At best it should take 5% of ship size and probably even less considering bulk carriers size and intended cargo. It's too big and cheap to need or be able to afford such bridge.
The fuel tank size is another matter that is reliant on type of drive used. Default assumptions are metallic hydrogen or fusion drive. As a base Eclipse Phase seems to use torch fusion drives but bulk carriers don't need them and can use more simple and less demanding designs with high dV but low acceleration. Additionally bulk carriers use minimal required speed to reach their destination to save fuel and reduce wear and tear on components which means their fuel tanks won't be that big comparatively to other ship types.
So 1/20-1/30 of size is drive.
Everything else is cargo storage.
Well and radiators around fuel tanks and drive system.
So back to the initial point, you can't increase the pressure of the hydrogen gas indefinitely. At a certain point the pressure would interfere with sublimation. Thus there is a maximum effective pressure which means a maximum exhaust velocity and a maximum ISP of around 1600. That's why to get the higher ISPs you have to use plasma, fusion, and antimatter drives.
Mainly that the idea that the only weight is the mass of the hydrogen and the nozzles is not correct.
2.5% of the ship's mass may not seem like these components are taking up much weight but since the nozzle for a metallic hydrogen ship only take up around 3-3.5% of the ship (I'm just guestimatting .5-1% for the mass of the ship for the tank walls) those parts are pretty significant.
actually with our current tech level ball bearings are more reliable and longer life than magnetic bearings
Bridge (or "bridge" in case of infomorphs) of the ship probably has additional internal shielding that can alleviate lesser hits. And any hit by a proton beam that goes through armour layer will bear a risk of charges with varying power levels.
It doesn't stop there. The way Beam armour works is that every "layer" reduces the intensity that passes through by a percentage value, so the more you have the better it gets. For example, the Hull plating values I listed will reduce 120KeV X-Rays by a factor of about 708 and the Combat plating by about 346 Million.
All that energy isn't vanishing – it's being dumped into the ship's armor (at best) and into it's internal components (at worst).
So either you're getting hit by a weak (RE: Handheld) beam on an unprotected section – or you're being hit with a VERY powerful one, and the issue of point charges is less vital than the Superconductors becoming less "Super", the internal atmosphere becoming so hot it's causing heatstroke and the aforementioned flesh-boiling.
As a general guideline, any weapon storng enough to penetrate Ship armor is strong enough to reduce it's contents to a fine paste.
Also, charged particle weapons are rubbish. They disperse too quickly, are ridiculously vunerable to deflection and magnetic shields make them impotent.
I put up a rough sketch of a bulk carrier design I've been working on. Would this http://eclipsephase.com/sites/default/files/bulkcarrier01_1_0.jpg be like what you're looking for? I'm working on putting labels and explanations on there, as well as probably moving the bridge module to its own page, but I've been itching to get it on here for a while now.
In the past we've had to compensate for weaknesses, finding quick solutions that only benefit a few.
But what if we never need to feel weak or morally conflicted again?
A decent start at the very least. I'm looking forward to seeing where you go with it :D
Current Status: Highly Distracted building Gatecrashing systems in Universe Sandbox!