Hey Aaron, good to see you back in business!
Good luck to you my friend. You deserve it.
If I had a 1290 I'd do another instruction manual for you if you ever did a box for that bike.
But I still love my 990 and won't be upgrading soon.
I bought a 1975 H2 Kawasaki for my indulgence instead - lots of fun!
But, you know, I have fitted a set of expansion chambers, rejected the carbs, got talking to the forums about the best way to liberate performance and all the wisdom is that, with this bike, it's best to run with the factory air box and filters. Ironic isn't it....all those K&N pod filters, bell mouths etc. we used to fit back in the early eighties actually made them run worse. With modern dynes and stuff to analyse the effects the wise guys revert to stock.