I would do this...
50% Extra Light DME
34% Extra Light DME (Late Addition)
10% Sugar (Late Addition)
6% American Crystal 20L
boil 60 mins 0.50 Northern Brewer
boil 15 mins 1.00 Chinook
boil 15 mins 0.50 Northern Brewer
boil 7 mins 0.50 Chinook
boil 7 mins 1.00 Simcoe
post-boil 30 mins 0.50 Chinook
post-boil 30 mins 1.00 Northern Brewer
dry hop 10 days 1.00 Chinook
dry hop 10 days 2.00 Simcoe
(Why bother with expensive liquid WLP001 for a low gravity IPA?)
I would not add Perle, but I would add Columbus. With Northern Brewer, you'll get more of a minty, earthy quality. And Chinook is more grapefruit than anything else.
Lastly, Irish Moss is not necessary for an extract beer.