OK then - could you fit two island platforms in the box? Based on my
crude maths and assuming straight track and a 6m existing platform -
no end or centre throws - the latter is definitely not true at the
south end or where S&C may affect the layout at the north end. It also
ignores S&C to achieve 4 parallel tracks not 2.

Platforms = 6.000m *2 = 12.000m
Track = 1.435m *2 = 2.870m
Track to platform 0.730m *2 = 1.460m
Six foot = 1.970m

Width of box = 18.300m approx.

For two islands you would need
Track = 1.435m *4 = 5.740m
Six foot = 1.970m
Cess=1.250m (minimum)*2 = 2.500m
Track to platform = 0.730m*4 = 2.920m

This would leave two platforms of width 2.585m - the HMRI minimum for
a single face platform is 2.5m. So no.

OC