I used the LPub3D format, exporting the finished file as a LDraw from LDD lxf.
I only downloaded and installed LDraw for the instructions manual aspect today. Its not a program I'm comfortable with, whenever I tried to use it, I got nowhere, so I stuck with LDD. The publishing side looks good, more sophisicated than LDD, however I hoped it would be a simple conversion, not a complete rebuild from scratch in LDraw, which by the sounds of things is what I'll have to do, if I give up on trying to sort out the html file. I could get the format looking good in Dreamweaver, just not as much as when I converted it to PDF, the page breaks carried over the parts inventory for each step on to another page. It probably needs a bit more work on the coding. I thought LDraw might offer a quicker solution.