Advise please

Hi Racers.

I have a track in the loft now,but I would like to move it to a shed in the
garden.It is well insulated and dry with heating.The area I have is agaist the
back wall.It is 4.6mtr long x 1.2mtr wide.I am going to have the base about
70cm from floor level to use as storage.
At either end I can go wider by 80cm,I would like to have a long main
strait along the back wall going to and from radius 4 90 degree corners.I will
be using Scalextric Sport track.
Any suggestions!!!!!!

Thanks Mike H.aka Extreme nerfer.