Rubber brake line replacement

[RocketScott]

I know this isn't a vintage truck forum, but...

I got the collector plate for my '89 379 Pete in the mail today. After putting that on, and peeling the DOT numbers off the doors, I started looking through everything to be able to drive it again

All the rubber air lines look bad. Some look like they are original with a woven cover that's cracking apart, others have been replaced but are cracking. Some of the fittings have been changed too. Found a galvanized plumbing elbow that I hadn't noticed before. Everything is rotted (Funny-I originally typed "rotted" but with an 'n' in stead of a 'd' at the end. The forum must think that is a bad word so changed it to 'terrible')

So basically I need to replace everything from the chambers to the hard lines, all hoses, valves, and fittings on all three axles

#1- All the lines I took off have a female flare connection. Most of what I'm seeing online have a male pipe thread end. Is that what is used now? Even though it's now a 'collector vehicle' I don't need to keep it original. I'd rather replace it all with the current standard

#2- I'm also not finding Tees similar to what was on there. They're aluminum and have a mounting flange. The back axle is just a single 1/2" NPT supply and 3/8" NPT x2 delivery but the front is double that, in one manifold

#3- The brake chambers are miss-matched on the very back axle. Is that an issue?

*numbered questions to make it easier*