This is a stock photo of just the instrument set-up trays for one open heart surgery.
It also requires a dedicated sterile OR. And a sterile pre-op prep area. And a Post Anesthesia Care Unit. With ICU monitoring abilities, and a full Code Blue stocked crash cart and defibrillator. And an ICU. And a cardiac telemetry step-down unit. And one to three board certified cardiothoracic surgeons. And an anesthesiologist or nurse anesthetist. And all the medicines and anesthesia drugs (and their reversal agents) required for that surgery. And all the IVs. And oxygen. And suction. And a central supply unit. And a sterile supply unit. And a circulating nurse or two. And a scrub nurse or two. And the PACU nurse, the ICU nurses, the Tele nurses, and about another baker's dozen techs, from lab, CT, OR, ICU, Tele. And the cardiac rehab folks. And metric f**ktons of antibiotics. All just waiting to take care of one patent.
Got a second patient?
You get to replicate half of that all over again. (I'll spot you the other half, since they're already there.)
Got a third patient? Now you need double everything in the first batch, because you'll need a whole another support pipeline for more patients than one ICU nurse can safely care for.
You can cut corners. That fills body bags, but hey, it's your party.
That's fairly similar to the kind of things you're going to need for one gunshot trauma chest wound.
Guerrilla Hospital? More like Gorilla Hospital. As in run by apes.
You can't just swap a few words and think you're going to replicate the military medical system, let alone the civilian one, for a "partisan" medic, and a "guerrilla" hospital.
Those are based on medical systems you couldn't shoot out of your tailpipe if you ate that whole surgical tray above, and grunted and squeezed for a lifetime.
A military CLS depends on there being a MEDEVAC (which you don't have) to take a casualty to a battalion aid station (which you don't have) or an EVAC trauma hospital (which you don't have), and once stabilized, to transfer them to an out-of-combat-theater tertiary care hospital (which you don't have), followed by ultimate travel to a stateside recuperation and rehab system, (which you don't have). Clever readers will spot a trend here.
What you can do is good initial first aid. But short of massive planning and preparation, you don't have any of that second aid, third aid, or rehab. And unless you recognize that, and start to make actual alternative arrangements, what follows your first aid, will be last aid.
I do not recommend leaving things at this stage, but if all you're going to do is stock your IFAK, without even planning for what happens the second time you need that, you're planning to fail. In a Forest Lawn sort of way. Or, far more likely, a Boot Hill sort of way.
Delusional people build castles in the sky, and psychotic people try to live in them. I wasn't being snarky about the OP, but when you start talking about your wonderful ocean liner plan, and all you're missing is, y'know, the BOAT part of that, I'm going to call you on it, 11 times out of 10. And if it stings, that's Reality slapping you in the back of the head.
You want an underground partisan health care system, or a guerrilla hospital? Great.
Why not start with telling me how you're going to do THAT, and do it first, before you tell me the frilly and far less important details at the weed level.
And while you're up, tell me about your partisans, before you start worrying about partisan medics.
If you can't get over your delusions long enough to do that, don't complain when people point and laugh. And if I just pointed and laughed because you share those delusions, maybe it's time to stop smoking mad bongloads of Hopeium, and come back down to planet earth for a spell.
And if all that still goes in your "Too Hard" column, don't you worry none, Snowflake. If you're just going to rely on Turd World/Civil War-era field medicine, you can count on Turd World/Civil War-era casualty levels.