To turbocharge a *ZZ-FE engine isn't far fetched, but to twin turbocharge it would be an overkill. The turbos would have to be pretty small in order to achieve that, but you really would not gain anything more than using one proper sized turbo based on the HP gains your friend is seeking.
If anything, a single turbo setup would perform way better than a twin turbo setup because the single turbo would spool up better.
If he's really adamant on going twin turbo, then he should sell his Corolla and get himself a Supra TT.
Here's another site to check out:
http://www.turbocorolla.com
Good luck,
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Regards,
Nobody can break it better than me.

88 I4 Slushie, 89 I4 5Sp, 89 V6 5Sp, 82 Corolla, 72 510, 88 Minitruck.