The Rollers and Frame components laid out. Note the bearings have been pressed into the end support blocks.
I used a socket from my socket set (with the same Outer Diameter as the outer race of the bearings) as a drift and a vice as a press to push the bearings into the 22mm holes in the wood blocks. It is quite a tight fit.
Take care no to push them too far in as the inner race will foul the bottom of the hole. (The 22mm Holes don't go all the way through)
After drilling the 22mm holes with the hole saw I drilled 10mm holes right through each 22mm Hole center to ensure that the 8mm drive shafts do not catch on the wood.