I have been looking for information/techniques or "how to's" on how to scratch build 1/35 hedgehog tank barriers. any info would be appreciated

Hello,

Did you definitely want to scratch them as a number of them are available in plastic, resin and etch.

There were different sizes by the way.
This book is very good. Covers a lot more besides.

Cheers,

Sean

http://budowens.blogspot.fr/

Rather simple!
Look at the construction, it are 3 H-profiles, available in the Evergreen program.
Eventually, you can make the extra supports at the crossing points from Evergreen as well.
Remember, it were rather simple, but effective tank stoppers. Not seldomly welded together at the site where they were needed.
So, do not bother if they differ in size, color or H-profile sizes.

thanks. the hard part is trying to get them to scale.

I just a quick Google search in images. There were a few variations in the basic style of 3 pieces of angle / straight iron welded or bolted together with support plates.
Most looked to be anywhere from 4' to 6' tall, when laying down in their natural position.

Actually, there is no scale! They should be heavy and strong, enough strength not to be bend easily by a tank or AFV.
They were made from H-profiles, with a length of 2 or 3 meters.

http://www.globalsecurity.org/military/library/policy/army/accp/en0065/le3.htm
Scroll down to pos. 3-16

HTH
Hans-Hermann