Be aware you can overdo the mechanical advantage part of forging your own simple trigger. I built my young son a miniature trade gun in .410 ga. years ago. I was fearful, that the simple trigger would have a trigger weight, that would interfere with his ability to shoot accurately. So, I mounted the trigger as high in the stock as I could. But, I didn't consider the length of the trade gun trigger. That trigger pull, although a long travel, was scary light, and had to be redone for safety.
A lot of new shooters, and builders, regard the simple trigger, as something to be avoided, when building a gun for serious shooting. Nothing could be further from the truth. Modern reproductions have given the simple trigger a bad name. The trick is mounting the trigger high in the stock ( but not too high), and never use one of those all in one setups that mount the trigger in the plate.
Hungry Horse