Sounds like it may end up nose heavy. That's only 200 sq.in. An 049 or so will fly it, but the 15 will give it plenty of power to actually stunt to some degree with the short span.
The pushrod forces depend on the mechanical ratios between the handle, the bellcrank, the control horn, the chord of the elevator, and the location of the hinge line on the elevator A longer bellcrank reduces the amount of tension you feel at the handle. Since it's a coroplast fun fly plane the original may have given more control feel with the shorter bellcrank.