Hello,
If this project is still pending (I know two weeks of waiting for a response can be nauseating!), here’s what I did recently to convert a client’s Smugmug site to WordPress:
1) Downloaded all Smugmug galleries into a zip file (awesome Smugmug offers this feature)
2) Re-built the site in WordPress (I used a custom theme and the Envira Gallery plugin to handle the photography-specific stuff)
3) Imported the the zip file containing the photos we downloaded from Smugmug. In our case we used Envira Gallery plugin’s “Zip Importer” addon… but I believe NextGen and other major WordPress gallery plugins allow you to import zip files natively or via an addon.
Again, the main steps are to grab a zip of your photos from Smugmug and use any WordPress gallery plugin that allows you to import a zip file into a gallery.
While there may be direct Smugmug to WordPress “converters” out there (I didn’t search at all), I like that this approach gives you the creative freedom to re-build the site with any WordPress theme… and doesn’t force you to live with any legacy stuff from Smugmug.
Hope that helps!