wrote:
I need plans for horse drawn vehicles.

A Google search for horse buggy plans turned up lots of hits, including
these:

http://www.mcinnisindustries.com/buggy.html
http://tinyurl.com/9sg9k

It'd also be pretty easy to just start building one from scratch with
some used mountain bike wheelsets - assuming you're not planning on
carrying more than a couple or three hundred pounds.

R