Definitely needed the busbars here are likely made of steelRaw copper bus bar stock...
RSreal MC4 conectors...
RSa variety of lugs in different sizes, quality
Found a reasonably cheap one that works fine and being an ex tool maker and issues with dies I can fix myself.Rebuild kit for your hydraulic crimper or a spare good one.
Have a bin bag of dry variant from searching for marine gradeHeat shrink in different sizes
Rtv is heavily used on the farmLiquid electrical tape for those things that you can't heat shrink
Have alot in my mother's cellar I'll try remember to grabPure copper washers
Cheers il look into those I'm dubious the busmann ones here are actually busmannFuses - the NH type are great for Asia and cheep in place of class T
Will likely make my own fuse holders wouldn't take me long and if I'm nickel plating stuff anyway best do a batch of everythingBs88 fuses and holders
Thankfully pretty much everything on your list is available here either from typical retailers or RS Online though I'm unsure if my UK account translates to the Thai counterpart. Finding marine grade heatshrink was a struggle at first but I eventually found it, naming here is the issue the majority of the time searching with Google lense is quicker.