Alright, 1.2 changelog:
-Blue's entrance to nat is now same size as red's
-Red could siege a ramp from 1st nat that blue could not; fixed now
-reworked topleft and bottomright expos
-mineral only nats can now be hit from cliff equally (blues used to be easier to snipe)
-corridors on sides are now of equal width (left used to be skinnier)
-left mineral only expo's building space is now equal to rights
-main choke is now blockable by gateway+zealot
-min only at nat choke are now closer to entrance to nat and main for easier sunkens
-more decoration
EDIT: T can wall in and secure a lot, but it would be a vulnerable wallin that could be attacked easily from the highground. Plus, then the other player could snatch both min onlys in center if T just sits behind wall.