I see you use the official UM2 heat bed, which is pretty expensive. Is there a difference to to just a generic one?
Also, do you have an other source for aluminium extrusion (or essentially everything you source from them) in europe than misumi? They aparently only ship to businesses as they require a tax id.
The aluminium base plate is also a pretty big chunk in the budget. Maybe this could be replaced by standard aluminium profiles?