I've been modeling since the mid-60's and never washed a model yet (outside of something I removed paint from) - never had any problems - use a good primer and you'll be fine/
I believe the Level numbers on Revell kits are more indicative of the number of parts than any particular detail. There are a lot of "Level 5" 2in1 kits in their line - the level 5 means extra parts for the 2 types of build.
If we've devolved into music - I was stationed in the US Army 30 miles from Munich when the Olympic Hall was "The" concert tour location for bands. The Army used to provide discounted tickets and bus rides to Olympic Hall from our Kaserne. I saw most every popular rock band from the early 70's...
I get it - your brain never really gets the idea that "can't do that any more". I renovated a 100 year old Victorian in Louisville 25 years ago - can't imagine how I could do that now.
I wouldn't be worried about hand-brushing camo - from what I understand, most of the camo was done in the field and I doubt they hauled compressors and spray equipment - probably brushed most of the camo during the war.