Hello Mats,
why do you not use an other name for your new piece?
'Elk' (German 'Elch')is already the name for a known fairy chess
piece
(look at 'http://www.softdecc.com/pdb/pieces.pdb?langt=EN&langn=EN').
There is already a lot of confusion because of the existence of
different names for same pieces, but the situation becomes extrem
mistakably by using same names for different pieces.
Alfred Pfeiffer
P.S.: This remark is valid also for other new pieces you introduced,
e.g. 'http://www.chessvariants.org/piececlopedia.dir/scorpion.html'
describes an other 'Scorpion', and maybe also the name 'Mammoth' is
already used by fairy chess composers (but I do not know their
definition).