Here is how I just did the bracket on a pedestal mount elk Im putting together. If anyone wants to add anything to it go for it. Or any ideas to do it better the next time. I did this on a moose aslo and worked great.
First I bulit my armeture that will hold the mounting bracket to the base, eventually it will be a series of rocks.

Next I welded some tabs on my square stock so I can screw a few peices of wood to it for the foam to grab ahold of. I also welded up the base for the upright that the form will slide down onto but dont weld up the upright at this point, you have to make sure that the form is still plum and this is where you can make adjustments.

Next was marking where the bracket is going to go into the form.

Now the fun stuff, Let er eat!!!! I used a 1 1/2 inch spade bit to do this part.


The test fit to make sure the angle is correct. If you notice in one of the pictures on the form I made marks on the side and back that I lined up the bracket with, it was easy to do by inserting the upright so you could see the angle of the bracket .

Once it was at the correct angles I screwed it in place with some 8 inch screws and foamed it into place, dont forget to put a block of wood on there so you can fasten it to a mounting stand. The block can be cut off after it is mounted.

This is where you hold the form up to the base and let the upright slide down to see if it is straight or if you need to make adjustments before you weld it to the metal base, sorry, couldnt take pics of that. Hope I explained it so you could understand.
Anyway this is the form slid onto the upright after it was final welded into place. Completely removeble.



Matbee that will give you some ideas on how your like to attach a pedestal mount. Takes about an Hour- hour and a half to do this from cutting the medal to having the form on the base.