I've started modifying the OSC Custom Product Builder to work with CRE B2B, but I've run into a bit of a problem because CRE's DB tables are a little different than Oscommerce. I'm sure someone who is more experienced than I could easily solve this.
You can download the original contribution here:
http://addons.oscommerce.com/info/6328
The admin side installs with no problem, but the builder front end needs a little editing to work with the template system. I've attached the files that I've been working on so you can compare. The main change was to create the builder_main.tpl.php template file. I don't think any of the other files need to be changed, but I could be wrong, after all it's not working yet.
I moved the builder.php box file into my template's boxes directory. Then you can use CRE's admin CP to install the new box. I haven't had to make too many changes yet, but I have very little PHP/MySQL experience so this takes me some time to work out.
You can see where I'm at with it by going to
www.proedgewheels.com and click on the Custom Product Builder Box. Choose your components and click build product. You'll see the DB error I'm getting. It originates from the includes/modules/builder_add_attribute.php file.
Let me know if you need any information I haven't provided.
Thanks!
JayCee