That's an awesome build !!
When I built my van out 3 years ago I bought alot of stuff from Aliexpress. (solar charge controller, 2x100w flexible solar panels, push button latches for cupboards, 12v fuse box, bus bars, electrical connectors, heat shrink, 12v LED light strips and 12v switches, 12v diesel heater and much more) I've actually been really happy with the Chinese stuff. I think that if you are going the DIY route some of the Chinese stuff can save you a fortune and is no different in quality. Big ticket items like the DC2DC charger I would still get in OZ.
I noticed on your site that you mention the flexible solar panel that you use blowing away. One tip I can suggest is to use Heavy Duty Velcro. Depending on how precious you are about the look of your roof, you can stick one side to the roof of the van (just 2 50mmx50mm strips would work for you) and one side to the solar panel. I've had this velcro holding down my 2 100w flexible solar panels which are on my roof full time for 2 years without any issue and they are one there solidly and not going anywhere (however I do use more than 2 50x100mm strips.)
You could alternatively stick the velcro to the roof racks or whatever else you have on the roof.
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