Flamestrike
Legend
The mechanics let me say it is an Elf though.To be fair, your custom lineage is an elf because you say it is, not because of any mechanical reason.
Mechanically I am allowed to say my lineage is descended from Elven parents, and I resemble an Elf (the rest of my kin).
Unless we're saying 'Glorifindel, the 5'8" fair haired and pointy eared person born to elves, raised by Dwarves and who resembles an Elf' is not, in fact, an Elf.
Which to me, seems like a rather inane, pointless and artificial line to draw.