My baby 15" x 15" machine

[wilfy]

just added everything up total length of steel is 11.7mtrs before cuts which will probs be closer to 12mtrs leaving me a good 3mtrs spare..

now i've just done this rough but with 3 mtrs if i extend the legs down by 500mm shown in white here, i have enough flat bar to put support where the longer bits are pictured and that will be pretty much it, but i have a feeling that wont be enough :s

in this picture i have dropped the legs down 500mm, as shown by the white bits, i've also moved the rail supports down and put a piece of 50x25 in the middle of the rail support. the turquoise blue bits can be removed i've just left them in so i can revert back.

my question is will this extension of the legs work or will it be a bit wobbly? this is the maximum use of the extra steel left over but it would make it better for me to have it floor standing as i know the bench is no longer big enough to support it.