Not a Lotus but I used similar aluminium front hubs on a Marcos 1800 (GT6 suspension) for several years. I only used it on the road but the guy I sold it to went on to modify it for track use (basically take out the interior, replace glass with plastic, make a lighter front end, put webers on) and ended up winning his series class.
So if you're careful fitting bearings/studs I'd reckon they are fine.
Brian