I have directions on my website for making an underquilt that might be useful. It's shaped to fit the HH BULA, but you can obviously make whatever changes you need to suit your own needs. I've got full plans, illustrations, and a list of materials. I've also got a free t-shirt offer going to anyone who makes their own. Let me know if I can be of any help.
"Keeping you warm underneath"
On the web at:
[Non-text portions of this message have been removed]