i can't wait to see what you come up with to get 800mm cutting area from a 980mm Y axis... i may just be copying your design if all works out well..

i have 654mm Y rails providing a cutting area of 381mm, so if you get your design up here and everyone says it's good i'll be doing whatever i can to reduce the size of my Y :D

good luck with the build i look forward to see the outcome