Dave,
In order to answer this you first must ask what style of rifle are you talking about? You going to want to lay out your plans to scale. This is where the Track of the Wolf catalog is a blessing. You just copy the side view of lock with sear position marked and the type of trigger positioned where you want it relative to the barrel touch hole ETC..... Here are some triggers and note that they are at several different heights. Some are very low and others not so. The tallest is a Germanic target trigger.
Draw out your plan for the lock, barrel and trigger you want and build it from where the components fit VS building it then trying to fit triggers.
Here is an example of a plan not followed as it should have. I had to bend up the sear to keep the trigger blade from being ground down too far. There are examples of originals with this exact same modification.