Timing belt drives

Any of you guys have experience with timing belt drives? I need as
compact as possible 1 1/2:1 reduction from a 600 rpm  2.5HP engine
(3600 crankshaft RPM with 6:1 reduction) then another 1 1/2:1 after
that (so lower speed higher torque) ( total reduction 13.5:1).This
will be driving a 20 inch diameter 2 inch wide tire/wheel.

How wide and how large do I need the small sprocket? For simplicity I
would likely like both stages identical. This simplifies everything
including tensioning
Small sprocket on output shaft  driving large sprocket on jackshaft
turning small sprocket driving large sprocket spinning on output shaft
of the engine/gearbox  with wheel attached to that sprocket. Distance
from center of small sprocket to outside of large sprocket cannot
excede 7 inches.

Is this possible/feasible???