In poking around finding an URL for RelTech's facsimile editions, I noticed this link to the Institut fur neutestamentliche Textforschung's Bibel-musem.

I was mystified at first, but just use the drop-down boxes at the top-left of the page to navigate. MS 676 (a 13th century MS) has content for much of the NT.

I believe many of these MSS are also at the CSNTM web site.