I went through the same thought process during my build. Their included components are very similar to my setup (the kit is legit, I wouldn’t change anything). Two recommendations if you’re looking to make it as small as possible.
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Omit the 120v and inverter. I’ve gone three years and still not installed my inverter. You would be surprised how few things actually require 120v in a rig.
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Victron offers a IP67 rated battery charger. I put that in the engine bay to save space. But you could install it pretty much anywhere out of the way.
You can search my history for the electrical build, I haven’t made any changes . (From 2021)