Just in process of building a baseboard and planned a 7x4. However now that i've cut the top to size and put it in situ it makes access all around pretty tight. I can get around one side with by back against the wall (about 9" gap) and i can stand behind fairly comfortably. I'm wondering as it is my first ever build and i've never tried any modelling or scenery stuff before, would i benefit from a bit of extra space or would i regret losing the extra room for layout if, i say went to 6x4.
Also could not get any 9mm ply near to me (tried 2 branches of B&Q and a specialist timber merchant) so bought 12mm instead. The whole thing will def have to be moved out to my garage at some point in the future and i'm a bit concerned about weight and maneouvering down the stairs. A slightly smaller board would be easier.
It is my first layout so maybe i'm better starting small and when it does move to garage i'll have oodles of space so could expand then..... I've got the jigsaw poised and ready to cut. what do you guys think...

BTW the trak mat is only there as guide for size, i won't be using it...
Cheers
Graeme