Wow! Hurrah ()!
What good news for a Monday morning. How many tests have you done by now - come on, own up!
Ready - we run a dehumidifier in our bathroom - with this on and the bathroom door shut (we sometimes leave it ajar so that it helps to dry out all of the house) we were able to dry flat nappies overnight, and the shaped cotton ones were only slightly damp by the morning. The bamboo nappies do take longer than this though - which is why we had cotton for the daytime and bamboo (when you could do with the extra absorbtion (sometimes with added padding on top!) at night.
We used mixture - you will sometimes have to change a nappy when you know that you will want to change it again in a short time and there seems little point in using a shaped nappy which you might use later. DH was fine with washables, and was also capable of the very straight-forward fold we used for prefolds (which we found really easy to use in terms of flat nappies) - we just placed a rectangle of folded nappy into a wrap (you just need to get good wraps!)
Just remember, only you will know about what the nappy looks like on the inside, but the wrap might be much more in evidence - some of them are worth having in full view!