i wouldnt recommend solid mount unless youre ready to do the whole thing solid, mustache bar and all, or you will break something viscious.
i already did, and am trying to fix as we speak.
oh, i used at least seven feet, i figured that too little amount is bad, and that too much could only be more safe, i used three ubolts to secure it and you do not want to see what it looks like under there! its pretty bad, but it works good and its ghetto. also, check that arrestor strap,
im gonna replace mine with nylon cable and a thick suspension techniques bumpstop in the mix too, also will be very ugly. im not the best engineer, but i keep the rubber spinning.