Just wanted to follow up to my earlier post about making this recipe with less than a full boil. I basically followed the recipe in the original post but decided to bump the Crystal Malt to 2#. I also used 2oz of goldings to account for the smaller boil volume.
The pumpkin was added to the boil, and it was a challenge to keep the threat of boilover under control. My little 4 gallon pot was struggling to contain everything, and the wort was the thickest i've ever seen. It coated my stirring spoon like syrup.
I transferred just under 3 gallons to my primary, and topped off to 5.5 gallons with an OG of 1.081. It's been consistently bubbling away at 66-68 for a few days now.
So, my advice to anyone considering this with a smaller pot, go for it, it's an adventure!