When I built mine I had seen a quick jack only once and didn't take any measurements, here's a general idea to start with.
I started by making the lower arm and front axle tubbing first, the angle tubbing was next, from there I worked up.
The first pic shows the angle at the rear (#2), the angle is 40 degrees, length of #2 is 7"..you could make it longer I guees if you wanted. #1 has a total length of 22".
Second pic, #5 is the front axle tubbing, 18 1/4", #6 is 3 3/4" and #4 ( sorry I didn't have it facing forward ) is 24". The distance between the top of #6 to the top of #5 is 8 1/2", that will give you the angle and length for #7&8.
Third pic shows the top pivot arm, agian I used 3/4" thread rod here, I drill a hole though the center of the tubbing. I then ran the threaded rod through the tubbing until it was flush with the top of the tubbing, welded the top as well as the bottom of threaded rod to the tubbing.
Fourth pic shows the handle, I made mine 39" long ( not including the insert at the end of the handle ), the insert has a total length of 9", 4 /12" showing and 4 1/2" inside the tubbing.
Not sure if this will be of much help but it's more then I had to start with..