Get a tape and measure a fed 5 and/or download some images.
draw some pictures of how you think it's made. If you can draw it you can't make it.
A fed five is flat 20degree y-frame with adjustable mast rake
20" rear wheels with cranked axles. 16" layover steering.
nothing to difficult about that. Simple looking yacht.
pictures come from google images search " fed 5 class 5 land yacht"