I don't think there's any limitations with images since they're not being hosted by the forum's servers, just pulled from the web from another server. I'd love to be able to have better features included here, but it would cost money. A few sponsors or advertisers would pay for such bills, but unfortunately there aren't too many typewriter manufacturers around anymore that would be interested in placing ads in our forum. ;-)
Why not try one manual as a jpeg and see how it works out?