To bring this back on topic, I agree with many of the comments above on the Nene - we've had some fabulous trips on it recently.
I hope the meeting goes well. I agree a few more facilities would be useful though with a bit of prior planning / phone calls I did manage to empty the Elsan quite easily (Hint: caravan parks are helpful!).
I do wonder if we might try some more creative thinking about short term moorings. There's a bit of a default assumption that a good mooring means a nice straight solid bank, with piling, neatly mown grass, and bollards, so that you can get on and off anywhere along the boat. Personally I would be happy with a nice solid post a foot or two out from the bank, that I could tie the upstream end to, and then use the plank to get ashore if I want to, and put a loose line (or a mud anchor) at the other end. If space is tight then herringbone moorings could reduce the space demands.