A little progress to report. Have the basic layout up in the new layout software package. I've used this software on a couple of projects before. I particularly like the (to me) straightforward learning curve, I have a lot of experience with ExpressPCB, and this program is similar but much more sophisticated and not tied to one PCB vendor. I have not had to read the manual. Their library has the QFN parts so I have not had to make any library pad layouts (though this program has one of the better pad layout tools). I'll have to check them to make sure the dimensions are correct, but it looks like all the parts I need are in there. It has been awhile since I used this program, but it seems to be coming back very quickly.
I'm doing it somewhat backwards, laying out the board and doing the schematic after, but it is more interesting that way and the part numbers fit the physical layout better, and I have a schematic in the other package to follow anyway. I will have to make parts for the schematic on the Intersil chip, I suspect.
If you are happy with your current PCB layout software, skip the next paragraph.
For folks looking to learn a PCB layout program that doesn't tie you to one (expensive) vendor, DipTrace is worth a look. For me it was easier to learn than the frustration of Eagle or KiCad, and it comes in various varieties from free and nonprofit to full professional / commercial. The free version will do 300 pins, autorouting, no board size limit, two signal layers and as many ground/Vcc layers as you want. The library has a lot of good stuff in it, and you can make your own pad layouts easily with the graphical pad editor. I've tried quite a few free/inexpensive PCB layout programs and DipTrace has been the best for me so far. (I get nothing from DipTrace, other than using their free version, and I will almost certainly end up buying their package soon). I like that you can upgrade between their packages by paying the difference, great for small projects and small businesses that there is no penalty for growing within their product line.
For PC boards I'm going to use OSH Park. I've tried a few others but for small runs and prototypes I've heard (from a variety of sources) that OSH Park is a great choice (ES Methods has used them also). Three double sided boards for $5 per square inch, including shipping.
For this board the area will be about 4 square inches, maybe a bit less. So $20 for three prototype boards, and about $4 each for a small production run of 40 boards from the same source (if it comes to that).
Here's a tutorial on setting up DipTrace for OSH Park board production - http://cryoarchive.net/tutorials/diptrace-tutorials/diptrace-design-your-pcb-for-oshpark-com/
I discovered that DipTrace will support rotating components other angles such as 45 degrees. This facilitates connections on the small square QFN packages. This is a feature not all packages support, and it is very helpful.