I'm just back from a long day at this site. The conversion was (so far) pretty straightforward. We also changed the valuation method to lot using the IM utilities. The open SO and PO are being hand keyed which is a big piece of the conversion.
We were able to VI the new UM, costs, etc without any trouble.
We did run into issues with the zeroing of the inventory by entering in zero qoh physical counts. As I posted elsewhere we went though and made the write-down but still had a value in inventory (zero qty, zero unit value). This was mostly resolve through the inventory average cost utility (thank you to everyone who responded).
This was just a test - our go live is naturally over the holiday weekend...