I have a 32 boat but do not live aboard.
For tools I use several sturdy plastic tool boxes:
---One 14" long for screwdrivers, electrical tools,knives and other small tools.
---One 14" L for the 3/8 drives, scrapers, combination wr. up to about 13/16, adj. wrenches, pliers, a couple odd wrenches specifically for working on the steering and stove diesel copper tubing.
---a third large one for the 1/2 drives, larger combination wr, up to 1.25", large water pump pliers, hammers, a trq. wrench, filter wrenches, 2 pipe wrench 14" and some odd balls I made over the years for specific jobs.
Yes, in all of them there are some misc. odd balls.
---another 4 lighter tool boxes for rope, rigging and dome snaps working, Sealers/glues, lubes/greases, screws,
Several bins contain electrical supplies such as heat shrink, term. blks, duct seal, switches, wire, clamps,
A couple years ago i closed in the underside of the salon 2x3 and put doors on with latches. Now those compartments hold the electrical crimp terminals quite nicely.
I made one rack that hold frequently used small tools so I don't have to pull a box every darn time I need a small tool, small pliers and electr. cutter, small wrenches screwdrivers, 1/4 & 5/16 nut drivers, small adj. wrench. Whatever has been a major pia to be constantly digging for.
I made over head bins and shelves with latched doors that hold more trays that then hold jars of hyr and flare ftgs, more nuts/bolts/washers by bolt size in plastic peanut butter and the like jars., They also hold the filters and such.
Milk crates, both the 4 jug and the 8 jug sizes can be used.
For oil and coolant I love the small 1 gal size red plastic jerry jugs. They hold 5 litres and can be fitted into many nooks and crannies where a larger container will not go. To boot they are tough, not destruction proof, but FAR better than the typical plastic oil or A.freeze jug. Of course they are all red so labels are needed. A felt pen works well but needs to be renewed from time to time. Or tyrap a plastic label to the handle. Those in immediate active use I wrap a piece of Velcro around the handle so I don't end up with multiple partial containers.
In my case I also have each fluid container numbered so I don't manage to leave one unused forever. When they are stowed anywhere they fit it is too easy to miss one or two constantly. I do then have to be sure to look for them though.
I do keep a battery operated drill aboard.but you may want additional items of that nature. I don't as home is close by.
THere is more but you get the idea. Really look around and you likely will see opportunities to store stuff. It won't be like the garage but good use of the existing space in the E.R. , lazarette, can help you. It will also take some time. My E.C. is quite busy now and I can see I have to be carefull.
You may have to build storage such as shelves, racks or compartments.
I no longer use metal or steel tool boxes. I ruined a couple of nice ones. Also the plastics tool boxes won't do the damage a steel one will if an errant box bashes something.