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Trying to make a horn bow...it broke!

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Mesophilic:
This is my third attempt.  The fist was dismal.  The second is serviceable but cast isn't where I want it to be, probably because I didn't reflex it much when I applied the sinew and the core too thick making the sinew and horn layers very thin.

Third attempt came out highly reflexed.  But I can't put it on my tiller tree without it flopping off. I can't even attempt to bend it enough to get a string on it.  The siyahs and the reflex make it very awkward.  I don't want to start taking weight off of it until I see how the limbs are bending. 

So now what does a guy do?
(I know this will not be a work or art, just going for functional)

Before sinew:



After sinew:

aznboi3644:
From watching most videos of horn bows the guys have jigs to bend each limb to help get it to brace. 

stuckinthemud:
+1, they tie the limb to a curved block of wood (can't remember the name of it) to pre-shape the limbs - I think just stringing the thing might be a bad idea

Mesophilic:
Thanks,  guys.  I found some videos and images of jigs and the preshapes I think one person called "tepelik".

bownarra:
Yes teplics are used but if you have a discrepancy in your taper you can easily break the core using them. Again they have to be just the right shape for your particular bow. They aren't used to shape the limb that is all done prior to tillering by making darn sure your tapers are good. If you have a weak spot on a limb and then try to bend it over a teplics you will break the core.
Personally because I know my tapers are good I go straight to a pegboard for initial stringing.
Be very careful about getting the teplics right. Unfortunately no-one can tell you what is right for that bow.
When you make the handle/fade area make sure you have a smooth curve going from the limb in to the handle. I can't tell from the pictures but it looks like you have butt jointed the end of the horn strip up against the riser? If so that is a bad idea! It will delam there. The horn should go all the way up the fades. Like most glass bows are made.

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