Farm sinks do require a bit more work on site. Almost all cabinet manufacturers make 'farm sink base cabinets' like yours in the photo. It's a universal cutout so you can cut to fit YOUR sink. With a lot of farm sinks (ie fireclay especially), their dimensions can vary +/- 1% or more. Some cabinet brands will do a custom sized cutout for you. In that case, you order your sink, measure it and then specify the cutout size on the cabinet order. I prefer 'apron front' sinks like Kohler Whitehaven....the cutout doesn't have to be PERFECT as the sink front lips over the cutout.

You also must install your own support for these types of sinks.

Yes the Kohler cast iron sinks will cover the cut. They are far easier to install

Wood grows on trees and shrinks over time, breaking the seal between the sink and the bottom of the top creating leaks. Contact Pete, please.

The Pete device has some issues in that it has only a few contact screws attaching it to the side of the cabinet and a single threaded screw adjusting it's height. That it is adjustable and looks good is it's added value. Over time I doubt it would preform any better than a well built wooded frame.

Video How to Install Apron Sink

http://www.diynetwork.com/videos/install-an-apron-kitchen-sink-65181

If you look up on youtube, there are more how to instructions.

If in doubt, hire a Pro.

Farmsinks are heavy filled with water

IMO since you really did not know what you needed to do I would hire someone to do this right.

Ours sits on a shelf in the cabinet. This was before they drilled the hole for plumbing:

"Over time I doubt it would preform any better than a well built wooded frame."

There are no adjustments to tighten a well built wooded frame that has shrunk and let the sink flange pull from the top bottom as there are with Pete.

@Joe You obviously like Pete. Metal shims would be what you would raise the sink with if it dropped. Even wood shims would be fine as that is what the sink base itself is shimmed to height with. A combination of both would be best of all. The wooden frame will never fail completely and only possibly need shimming. In reality since the 2x4's are kilm dried when installed and are in a somewhat moist environment under a sink the wood shrinking would be less likely than wood compression due to the weight. It is also the time tested method of installation.

it is just as likely in my opinion that the Pete device would sag as the screws pulled in the plywood and the single screw raising the frame took stress and vibrations. If the homeowner knew what they were doing adjusting the Pete device would be a lot easier which is it's biggest advantage. But overall I think either method is fine.

Here's a close-up the perfect insect habitat created by the leak, the wood, and the darkness. Right next to where you're preparing food for your family and no way to clean.

Now you are getting silly showing water damaged poor framing. Do you have stock in Pete, is he a relative, or are you just a little hyper about this topic? Please don't copy and paste what I just typed as is your usual response to any disagreement on Houzz. I think we are all getting tired of the repeats in quotes.

How is it "silly" to substantiate one's claims with picture proof?

No, I have no economic or other connections to Pete, but even if I did, my circumstances are irrelevant to my arguments.

Couldn't control quoting, I see.

Look at the sensible DIY video artistsharonva posted. There can be more ways to do something then you particularly espouse, and others preferring those ways doesn't make you wrong, The photos you posted don't show the proper installation of an undermount sink, much less the farm sink we are actually discussing. So they are only proof of a lack of people skills.

I'm done debating now. Feel free to quote at length.

One option if you are going with a Stainless Steel sink is the EZApron sink by Nantucket Sinks. Here is a video clip https://www.youtube.com/watch?v=wCvBz_Lzb9o  You don't have the fake drawers but you do have a fascia board which this sink would slide down and over. They have 33 inch models which would serve your need.