These things normally ride until there are enough people ready to buy. Could take months.
I would contact them directly when you are ready to make a purchase though. Just to see what the difference is. 1800 is what the price is in the thread where it was created. 1800- 2500 is a BIG gap. 700 to be exact. If you have access to the raw materials, plate steel, I would look at possibly bartering with them on providing the material and they do the rest and see what kind of break you get.
2 months ago, a buddy had 3 huge sheets of 14 gauge and 4 x 16 gauge steel he wanted gone off his property. If I had storage area for them, I would have snagged them. Instead,. craigslist they went for $100 total. They were on his property when he bought the place.
If I had the space, and a welder - I would have tried to tackle this project myself. With all the pics posted, the design looks straight foreword and replicating it would be fairly trouble free. They worked out the kinks already, even the skid plate. *going to archive the thread just in case it is pulled for trade secrets*
Most of the money being charged is for the man hours labor.