Check with carpet shops for some 8 pound carpet pad scraps. You can glue them together to get the thickness you want. Try to make the saddle wider under your butt as much as the material will cover, something like an English saddle for horses. You might try some temporary padding to get the idea of what works for you before you glue it down. I need relief holes cut into the foam under my sit bones.
Experiment a lot to find what works for you before you use a lot of glue and staples. Here's a source for some gel and top quality foam padding: http://www.kemmlerproducts.com/products1.html
The illustration you posted, as you might know, is for the Specialized Body Geometry line of bicycle saddles.
The dynamics of a bicycle saddle is generally much different than a motorcycle saddle. Given that the V-strom has a relatively upright seating position, you sit less on your ischial tuberosities also known as "sit bones" thank you do the fleshy, fat, and/or muscle tissue of the butt. The fact that on a motorcycle you are riding with your knees in a constantly bent position also causes you to sit on your flesh more than the sit bones.
The only motorcycles that more closely approximate the dynamics of a bicycle saddle are dirt bikes because of the narrow saddle profile and longer seat to footpeg distance which straightens the legs out a bit more. When you are riding a bicycle, you need a narrower saddle to allow you a full range of motion while pedaling to prevent any chafing or soreness of the inner legs and thighs. That is why most cycling professionals will recommend finding a seat that is just wide enough to support your sit bones, so you get that needed support without excess width to slow you down and cause you pain. That Specialized Body Geometry fitting tool allows you to find the correct saddle width for your body.
Back to the motorcycle saddle issue...Given the different dynamics, you must look for something that supports your whole butt. This generally comes down to a function of saddle shape and firmness. If you could take a mold if your butt and perfectly transfer it to a motorcycle saddle, that would probably be the most comfortable thing you have sat on. In fact, you could probably make it out of a hard material such as wood or plastic and it would never be uncomfortable as long as it was so perfectly made that your weight is perfectly distributed evenly around the surface. That will never happen, so the best you can do is get pretty close with the shape. Then, the rest of the battle is finding the correct density foam to suit your weight, shape, and comfort preference.
I truly think the best way to find a good fitting saddle is through the assistance of an expert in the field. You already said that you don't want to spend hundreds on a custom seat like a Russell or Rick Mayer. That is understandable and even the aftermarkets like Sargent and Corbin are 4 bills. You might want to look into some of the people who are experienced in reshaping your stock seat using your height, weight, and photos of you on the bike. I can't speak for the results as I have never had any such work done, but there seems to be a lot of happy folks out there who saved a bunch of money by going this route.
For example, there is a guy in Florida who's company is named Spencer's Seat Mods (greatdaytoride.com). I think his services range from $50-75 for a basic reshaping plus the cost of shipping both ways. Obviously the biggest down side is you have to send your seat off and be without it for a few days. You can generally pick up stock seats pretty cheap which might not be a bad idea. Then, you can keep riding and sell it when you get your reworked seat back.
If that isn't up your alley, there are also the usual suspects like beaded mats and air cushions.