I am removing my kitchen cabinet support posts.

The cabinet is attached to the main beam of the house along the length, and to another cabinet at one end.

Can I attach a 3/4 inch plywood piece inside the cabinet top with an angle iron connecting along to the beam?

Is there an easier way I can secure this cabinet, without hanging it from the ceiling? I would like to use the main beam as a support. The cabinet has been firmly attached for 14 years in this position, but we are getting new counter-tops and need to remove these 2 end support posts.

I do have pictures of this, I will post when my post count reaches more than 10.