That looks awesome
For larger boards like in your first example, would it be possible to setup a hotkey to zoom in to the specific area of the board where the part should be placed? Hitting it again should jump to the next position for lines with multiple items. Or maybe enable that only in ungrouped mode.
I like that you can click on components to get to the BOM item, but it can be difficult to actually hit the component. In this assembly view, is it actually useful to be able to click on traces or pads? For pure assembly i would think that clicking on a pad should select the component to which the pad belongs.
Minor nitpick: In the BOM itself, the table headers "Sourced", "Placed" and "Quantity" are broken, that looks very odd, and the column width cannot be adjusted to make them fit.
Sorting for the proper assembly order (i.e. part height, parts blocked by other parts, and stuff like that) has to be done manually by whomever creates the BOM, i assume?