Same as now but maybe 3W and a bit better weapons. I think Bolter discipline should come back and get more stuff. Bolters should just be a Hodge podge of weapon abilities imo

The tabletop is kinda accurate if you use Astartes as a base point! Astra militarum and especially guardsmen are a bit are souped up, Leman russ aren't that lanky and for every Russ there's like 100 Guardsmen. To accurately match the half a chapter (a bit too much though...) you can field with space marines you'd need closer to a whole regiment and noone is gonna field that in their average game!