Thank you for stopping by jaffro, kind words!
Yes, I considered using the salt / hairspray method to do chipping, but a lot of videos out there show that you have to dunk the model under running water while furiously scrubbing at it with a toothbrush (at least for hairspray) - somehow not the best idea for a paper model
Also, a lot of modelers seem to choose sponging instead of masking, since they
have more control, and in the end it takes a similar amount of time with all the drying time required.
Unfortunately I didn't have a lot of time in the last week to work on the model, plus we are going on a road trip over the next two weeks, so it'll be a while before I dive back into this again.