I agree that the loads infront of the firewall are great. Therefor I have decided not to make any lightening holes there. All the lighening holes is on the firewall and aft of it. As can be seen on picture.
The loads do however distrubute when it reaches the firewall though. Part fo the forces goes thru the firewall conected to the fuz sides, and another part thru the engine box sides to the wing spar directed to the fuz sides, finally there is the F2 fuz bulk head -> fuz sides again that has to absorb some as it also is connected to the enginebox sides. But as you meantioned, in front of the firewall there is only the engine box by itself and I dont dare to manipulate with this area.

Also I am planing to leave the part that is mounted against the firewall and holds the cowl as is. This as I don't want crap like fuel and dirt coming into the fuz. But yes I agree with you these two parts are heavy.