Don’t use studs in your shoes, not long ones anyway, it’s mainly rocky under foot, the only grassy bit really is Simon Fell which has ‘steps’ in the grass from everybody else walking anyway.
Don’t use shoes that are overly stiff either, my normal race boots are Specialized S-Works but they’re so stiff I’ll use my old Scott shoes instead.
I use 1 bottle cage with bottle, drink it on road sections and pick up another at the foot of every hill, you might want more fluid however as I aim to be done in 3:10 or less.
I use 34/46 with 11-36 Sram 10 speed cassette and mid cage mech.
Do think about using chicken levers, not because you can’t ride in the drops but because you will get neck ache after a while from trying to look up. I also throw another headset spacer under the stem for the same reason.
You don’t need pipe lagging if you carry the bike properly, most people seem to hang it from the top tube/seat tube junction on their shoulders, you should have the bike much nearer the head tube with your arm taking the weight.