Sofa bed in pieces! (Fleetville AL1)

This is an AMERICAN sofa bed (called a "futon" in the US). We took it to pieces a few years ago and lost the screws. I bought some new ones but can't fit it back together again. It is possible that someone can adjust the holes to fit the screws... but I can't guarantee the screws will work. The wooden parts have been stored in the garage and need to be cleaned. The mattress has always been in the house so is clean. BUT this is an American product and does not fit standard British sheets etc. or have a fire label. When set up as a sofa it is about about 7' long and 2'6" deep. The mattress is an American "full" size mattress and is about 74"x52"x8". I have given measurements in feet and inches because it is a US product. Please ask questions if you are interested.