Well one thing I figured out on my own which might have been useful is that when you use a spanner to rebuild the hull;- you can actually play with your hotkeys to reset the swing timer on the spanner;- thus enabling you to rebuild the hull faster
In my case I'm using a Spanner on hotkey 1 and a Mallet on hotkey 2; and I just do a really fast sequence of : 1, M1, 2, 1, M1, 2, 1, M1 (Which in words would be : Select spanner; click hull to rebuild; select mallet; select spanner again; click hull to rebuild; repeat)
This is probably nothing new and all the vets probably use it but I figured it out all on my own and I was proud of that