Paduke has a very brittle nature to it, and can really put some snap in your limbs using it as core wood in limbs. I used to mix it with Zebra wood for building hot rod bows, and used it many times for wedges and accent strips too. I wouldn't hesitate to use the paduke for an I-beam or a footing either, but if used as a main riser material you would have to be very careful to cap any end grain run out exposed or it will split easily. The shape of your riser will determine where it could be used...
But like the others have said here. There are much better choices on Red color riser wood. Bubinga, and Bloodwood are seriously dense, and by far a better riser wood choice.
BTW.... be careful using that eastern red cedar for core wood in your limbs. I dont think id use it for anything but veneer stock myself. It has very little strength properties in tension, and has terrible compression properties. I tried using it as a light weight core stock for some carbon limbs years ago and it failed miserably... Beware of using thick lams towards the belly side of the limbs. It just wont hold up well... I had glass limbs fail on some prototype limbs using it for core stock too. .02 cents worth.