Can I do this?

[HLaB]

I'd like to get into Audax and I've seen a route that's peeked my interest. It's not as flat as a pancake but
it's not really hilly and it's 112km long door to door.

Can't say I've done any training but I have been doing quite a lot of walking recently and I find I can walk
35km and not die the next day. I'm classed in BMI (27.5) terms as overweight as 1.5 stone over the top of the
ideal range.

Is it absurd just to dive in an do the whole thing in one go? I don't mind a bit of pain and exhaustion but it
would be better not to collapse / end up in a ditch / DNF. I'll be taking food and water along with me to make
sure I'm sustained.

It depends are you bike fit or just walking fit, if so it'll take time to build up to it and you don't say what date the Audax is. If you are bike fit you can do almost any distance at the right intensity if you have the right mentality.