Cover Crop Roller

Here are a couple photos and a detailed set of blueprints for duplicating a crimper roller built here in Quebec by my neighbours. The research project that brought it to life and paid the draftsperson were all run on public funds so I suggest that it's open to duplication. I can probably find out the exact status of the license on the blueprints if someone wants to know.

I have purchased half interest in a 15' roller. All of my cover crops are mixes (usually 8 or more). I would like to use my roller to selectively kill what i don't want growing in my cash crop. ie, in corn i will use a clover mix and/or hairy vetch. If i have these planted with a cereal (or 2), and a couple of brassicas, i am thinking the cereals might create a mat that could protect the clovers. The vetch however will be a different story as it will be as tall, or taller than the cereal.