Aright guys

,
After reading your replys and doing some research over the weekend i have come up with a plan of attack.

What if i use 6x3 treated timber for the gate posts fixed with 100mm coach screws M10.
Use 4x2 treated timber to make the gate (two stiles, three rails, and two diagional braces connecting the rails).
Use slotted wood screws for the gate cladding, but i am unsure about what timber size would be best for the cladding.
Use 50mm oval head nails for the weatherboard fence cladding.
What do you think guys does this sound ok?

Any advice about what size timber to use for the gate cladding?

Also the guy at the merchants was trying to convince me to use x4 or 4x2 for the gate post does that seem like a good idea (i suppose you would of suggested it if it was)?

hope you can help