If this all works out I'll bore and sleeve a 24.5 set. Then no mill work. Don't forget to add a couple of opposing holes in the bearing seat so you can use a drift to get the bearing races out.
Get that. When I was working I had access to the protype shop. Everything (bridgeport, hardinge, etc) including a 32 inch swing colchester. And always lots of material laying about.
BTW that looks like a 6000 series alloy. If you have the ability (I think you need like 900 F) you may want to think about T6ing those. If you're constantly hard braking on slicks the braking forces may drive the bearing races into the part. I cracked the upper tubes at the head on a trellis from braking forces. Just a thot.