Making a chair to sit on!

I have a chair:

Which I tried to make sittable using a copy of lua/autorun/base_vehicles.lua, But it turned out like this:

Here is the lua for adding the chair:

[lua]
local Category = “Custom”

//
//
local function HandleRollercoasterAnimation( vehicle, player )
return player:SelectWeightedSequence( ACT_GMOD_SIT_ROLLERCOASTER )
end

local V = {
// Required information
Name = “Matt J’s Chair”,
Class = “prop_vehicle_prisoner_pod”,
Category = Category,

            // Optional information
            Author = "Matt J",
            Information = "Matt J's Chair at home!",
            Model = "models/mattschair/mattschair03.mdl",
            KeyValues = {
                            vehiclescript    =    "scripts/vehicles/prisoner_pod.txt",
                            limitview        =    "0"
                        },
            Members = {
                            HandleAnimation = HandleRollercoasterAnimation,
                        }

}
list.Set( “Vehicles”, “MattsChair”, V )
[/lua]

How can I perhaps rotate or move the chair so the player sit’s the right way and position on it?