GR translation: truly as he could make her

[Mike Jing]

V421.26-36, P428.22-32   It was not, in fact, even clear to him that
he had made a choice. But it was in those humming moments in the room
smelling of a summer day, whose light no one had lit yet, with her
round straw hat a frail moon on the bedspread, lights of the Wheel
slowly pouring red and green over and over outside in the dark, and a
group of schoolboys singing in the street a refrain from before their
time, their sold-out and cruelly handled time—Juch-heierasas-sa! o
tempo-tempo-ra!—that board and pieces and patterns at least all did
come clear for him, and Pökler knew that while he played, this would
have to be Ilse—truly his child, truly as he could make her. It was
the real moment of conception, in which, years too late, he became her
father.

Whats does "truly as he could make her" mean?
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Pynchon-l / http://www.waste.org/mail/?list=pynchon-l