Trail Trekker Carts, anyone use em'?

[King Saba]

So lately I've been having a heck of a time dragging my kayak across sand and getting it onto my cheapo cart I snagged off of ebay for 35 bucks. The thing is that I'm not willing to put down all that money on an already made cart, but instead I'm planning to build one. I'm thinking to base my design off of the trail trekker carts. Anyone have any experience with it? Is it a good design or should I avoid it and go with the traditional scupperless PVC cart designs. Thanks!