My experience with building my own is decide which drawers will carry the weight, in my land rover I have a steel drawer system, made from 1mm sheet metal and covered in marine carpet. They have survived 40,000km of corrugations. The drawer runner are rated at 120kg, and I have about that in the drawer all the time.
On my truck, I made the main drawer from 1.2mm sheet metal. I have two pairs of runners rated at 90kg each on it as it can hold around 180kg - it is the main food storage drawer and will carry all the cans, etc. I have two catches, however they are only 25kg each. I will probably need a locking pin to take the load to ensure the drawer stays put when off-roading and does not break the catches. The folded sides really stiffen them, and I have internal bracing to stiffen the drawer front. The clothes drawers are made from 0.8mm steel but I had to reinforced the front around the lock, I used the same 25kg latches but that should be adequate for clothes.
The kitchen drawers are 3mm aluminium as I wanted a flat side to maximise the space in the drawer and are very stiff and not too heavy. I put two catches on them, they are rated for 15kg each, so should just be enough for pots and pan etc. Drawer runners are rated for 50kg for the pair, and are on the bottom of the drawer to spread the load into the frame.
My fridge and freezer runners are rated at 100kg, the latches on them are anti-burst door latches, rated for 300kg.
I used a custom laminex/plywood/foam composite panel for the lining and cupboards , it is very light weight but pretty difficult to work, and expensive, in hindsight it is a bit over the top, but very strong- the whole interior lining, cupboards etc out weighs less than 100kg. The big steel drawers and the fridge slides are heavy, but they need to be robust as the freezer will weight around 60kg and the fridge around 80kg when full and they need to be robust.
For hinges, I have used stainless steel piano hinge, as it spreads the load across the whole panel, to minimise stress concentrations.
I used Sikaflex 252 to stick it together - each joint has a 3mm minimum rebate into the panel, as you need a decent amount of Sikaflex - too thin and it doesn't have enough strength. I also used epoxy resin on each screw, just a drop but it reinforces the plywood and should help from pulling out.
Hope this helps