I'm building stands for my 75 and 55 this weekend.
I'll tell you what you need for the 55, this all depends on how high you plan on making it.
Mine will be 48 - 50 inches long, 28 -30 inches high and about 18 - 20 inches wide.
At these dimensions I figure I'll need 8 2x4s 8 ft long, 3 1x4s 8 ft long and 1 half inch thick plywood sheet ( you can probably find a scrap piece to use, but get 2 so you can have a bottom shelf). I'll be using screws and not nails, but either way you'll want some 3.5 inch nails and some 2 inch roofing tacks.