I purchased a KTM road book carrier but found I had to lose some of my steering in order to fit it so it went back and had this made.
6mm steel rod for the main frame with 1.2mm sheet stitched in between the bars to keep it rigid. There was to much flex with out the sheet. Drilled a heap of holes to reduce weight but kept the strength.
Finally folded up a GPS carrier out of some 2mm alloy welded to some 5mm alloy that bolts to the 1.2mm flat sheet.
Dont criticize someone till you have walked a mile in their shoes,
at least then if they get angry they will be a mile away - and barefoot.