I too am getting the same error at step 3 :
G1 X1 F6000
Error: G0/G1: insufficient axes honed.
Any ideas why ? My customconfig.g matched your screenshot.
As mentioned by Simon Millyard, in step 3 it is only possible to secure the bracket using ther top 2 bolts only as the bottom one is not correctly aligned. So I am also continuing with only the top 2 bolts secured.
By step 4 I had run out of tee nuts, so did it mean to use drop in tee nuts instead ? I also used spacing of approximately 220mm centres as this is more evenly spaced.
Would be good if the rails and extrusions were pre-threaded for the screws. At the moment they are putting up a fight trying to make the thread.
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