can't comment on PF engineerings' plans but can offer a suggestion - if you've got the patience to wait a bit, you ought to be able to find one prebuilt
i bought one earlier this year that literally was a bolt on affair - for $350 and it came with the tractor it was on (tractor is a basket case) - it needs all new hoses and i'm going to modify the hinge bosses a little but otherwise it saved me a lot of work, time and some serious coin
there have been quite a few show up on egay and a few of the other forums that folks picked up from 350 to 1000 - more have surfaced than i'd thought would, but only noticed after i found mine
if it helps