How To Build A Fort On Mount And Blade Mod Attaching / Mounting Tree Fort Platforms?

Attaching / mounting Tree fort platforms? - how to build a fort on mount and blade mod

I have an oak tree with branches 10 inches. I want a platform to build for 4 x 6 beams 4 branches. Two branches are horizontal, and two diagonal. I have not felt anxious about the joints in the horizontal branches, but what is the best way of connecting joints diagonally? Both are about 45 degrees. I will use 1, each 1 / 2 inch lag screws galvy with 3-4 cm of penetration in the industry. If the offset screw enough? If not, how many screws can be installed without danger to the health of the tree? If extra screw in the vertical direction (vis-à-vis the length of the penis) or damages. What about belts?