I've successfully installed an EBH on my wife's HiHy and took photos and wrote up an article while I was at it. I think Jason's going to post it here under the "Learn" forum, but until then you can find the link HERE
Was unable to upload the PDF here so you can download it from the HiHychat.com link above.

If you just want to see the photos they're HERE

Evan E. Fusco, MD
'04 Prius/BC moded to the T
'06 Highlander Hybrid Limited AWD w/NAV