Phew ! Nightmare to explain but i'll give it a go . Firstly , no point in making it too hefty as you don't have that many apples or hefty timber .
So , two uprights say 4 foot tall , with a foot on each say 2 foot long . Lay the feet on the floor so the 2 inch side is on the floor .
Fit the upright in the centre of each foot (to make an upside down capital T , with the 3" faces together . Use coach bolts to fix .
Now get 4 cross beams 2' 4" long . Fit 2 at the top and 2 about 2' 6" from the top, fit the cross beams one each side of the upright . These may need to be held with threaded rod , if you can't get long enough bolts .
Make sure the frame is square before drilling and bolting .
With the lower 2 crossbeams , one can be an 1/8th of an inch or so lower than the other , to give a drain off slope .
Now you need 2 bits of ply about 2 foot square each . One to lay on the lower crossbeams , to take the apple layers , and the other to go on top of the layers . These may need beefing up with 3"x2" to take the pressure . In the middle of the top 2 crossbeams , on the underside , fit a short bit of 3"x2" , from front to back . To take the top of the bottle jack , which will sit on the topmost of the ply boards when in use .
The lower of the 2 ply boards will need an edge of say 2"x1" to hold the apple cakes and to direct the juice toward the gap that you will need at the front , under which you place a bowl to catch the juice .
Use clean sacks to lay the apple on ,in 1" layers . Fold up each layer and lay another sack on , fill and so on , place top ply board on , leaving enough space to fit bottle jack .
Place bottle jack on board and under the central 3"x2" on the top crossbeams and gently pump the jack handle . Don't go mad , just gentle pressure is all that is needed at first . As the flow eases give another pump on the jack until no more juice flows .
Job done .
Don't try to use nails or screws to hold it together , they won't hold !
Big bolts or threaded rod
about 1/2" thick .
It will work ok .