So how did the latest shooter know where Trump would be ??

[FlyingClayDisk]

If the SVD was a hot rifle, as in reported as stolen) then I can see a dimwit swapping out the stock for an aftermarket hunting rifle styled stock. As for the magazine, why have that many rounds if he was only going to shoot Trump. I mean he should have known a shoot-out with the Feds and Local Police wasn't going to happen, he'd be killed. 

Since Florida has the rifle right now, I hope they use that technique to pull up the filed off numbers and see where the rifle came from.

The rifle in the picture has a magazine designed to hold a 39mm cartridge.  The SVD cartridge is a 54mm cartridge.  The pictured magazine (the one inserted into the rifle) is not capable of taking a 54mm cartridge (it's too long).  The SVD was never chambered to fire a 39mm cartridge.  This is how you know it is not an SVD, regardless of any other modifications which may have been done to it.

Edit - Even though both rifles have a 7.62mm barrel, the (39mm) SKS cartridge is too short to be fired in the (54mm) SVD chamber.  The receiver wouldn't close against the back of the case.  And, if by some chance the extractor managed to hold the round up against the receiver (as a result of it being a rimmed cartridge, thus the "R" designation) to where the firing pin would impact the primer when the bolt locked, well, I feel sorry for whomever is holding it when this happens because the rifle will more than likely explode due to a massive over-pressure in the 15mm headspace between the cartridge shoulder and the chamber wall.  I've seen an AR go Kaboom with less than 0.1mm too much headspace (like 0.05mm) and it was catastrophic!  With 15mm headspace that thing would blow up like a hand grenade.