#1. Wild stab in the dark, I'd put my finger on £2500 without seeing the bike. 17k miles, all self serviced by a forces engineer, you know that bike has never missed a beat. Getting the tools etc is good, but I wouldn't really pay more money for them with the bike. Of course, that's just me.
#2. One of those pipes is the fuel overflow. I can't remember what the other is. Your crankcase breather (if it's the same on the K4 as it is on my K6) comes up inside the airbox.
Good luck with the DAS, and don't be tempted to do your test on your SV. They have a slightly wider turning circle than ER5's (which almost everyone uses for DAS), and can be off putting on u-turns etc. Also, if you drop the bike on your DAS/test, you don't break your bike.
Let us all know how you get on.