advice on building materials for bunk bed and fixtures Information, help and advice on many architecture, self build and design problems and issues

[barnsley]

I want to build a bunk bed.
I'm not confident on the fixtures to be used.

I'm thinking of using
4 posts @ 2x4inch (or 3x4)
4 side rails at the bottom also 2x4 or (1x6?)

FIXINGS - for side rails to posts:
1x Hex Bolt Zinc Plated 10 x 120mm (or will I need 2 to connect each side rail to each post?)

p.s. This is going to be a double decker bus design so I'm going to attach 12mm thick plywood all around the bunk bed (this will also brace the frame and add extra strength).

I think i will notch out 1inch of the deepest part of the 2x4 post to the side rails which connect to this side.

does this sound feasible?

[barnsley]

change of plan,
I've just seen some cheap timber at B&Q:
£2.44 38x63x2440mm
or 2.5"x1.5"

I figured I could make an L shape on each corner (using 8 of these as posts).
I could use 6x65mm or 5x75mm screws to join 2 of these together.

Hoping I could still use the same size timber for most of the horizontal side rails too which connect to the posts?