I was looking at possibly drilling the arb to accept a machines fit setup so the bar can be adjusted, yeh it'll be nice to know what the track would be, the rear might be the hardest as I think I can only use spacers to change the width

Yeh the Sierra hubs have a better bigger bearing setup and have a bigger better range of brake upgrades

I might just buy a load of second hand legs and arms etc to see what suites