For those wondering what it’s like, with a spare 40 min, I have a headcam of my entire qualifying run from last year up here:
Started beyond the back of the last row, due to getting a last minute entry. Which was more than a bit annoying, as I didn’t get past enough folk to get to actually have a clear ride through the techy sections up top.
For folk considering lighter bikes, yes lower down it’s flatter/not as tech etc. But then consider what your arms feel like after 30 min DHing, and if you’re gonna be making mistakes, want a bit extra bike to soak them up.
A bigger bike will only make you slower on the climbs (though you’ll be fresher into them), whereas a shorter travel bike might have you on your face if you mess up.
However, some folk do whinge about riding up hills, in which case take the light bike and quit moaning ;-) my view is it’s a race, i’ll either stand up and hammer my DH bike up the hill, coast the next section to recover, or just walk it briskly. But as folk above have said, you’ll still have fun on a HT, so take whatever you want, you’ll enjoy it! Building a bike just for it is daft IMO unless you want to do really well.