That was fast -- just 36 minutes from the time I posted to you checking the old tape measure, going to the hardware store for a new tape measure, re-measuring twice and posting new data.My bad was useing old measure tape with missing front section
Quick trip to hardware store and new measure tape says 421 cms?
Got soda remeasured and tape says 422 cms from projector screen to projector lens ?
Once my kids get here i will have them measure with new tape
Now, back to the other measurements. You said the bottom of the screen is 25.75" from the floor so let's round that to 26". Sitting in a typical chair the top of a typical person's head is >40" off the floor. So your head would be overlapping the screen by at least 14". Your projector lens is 422 cm (166" or 13' 10") from the screen and your heads are 3' from the screen and overlapping by at least 14". It's not clear from those measurements how your head would not be in the light path. But a simple photo will help explain that.