One thing you can do to set your mind at ease, is to measure the full travel of your unit. Slide the carriage all the way left, make a mark at the center of the router bit, slide it all the way right, make another mark, repeat for forward/backwards of the gantry.
I think you’ll find the unit can move the distances claimed.
When you’re working at that size, however, you’re working right at the margins. So you do need to be careful and precise with your stock alignment and determining that you can reach everything with your bit. Otherwise you’ll experience a “crash.” And don’t let the word “crash” scare you, nothing terrible will happen (you might screw-up a piece). But the machine will be okay.
If some of your plans need to be changed feel free to post-back more details and the folks here will help you chart a path forward.
I think once you have some time with it, you’ll realize it is a pretty amazing machine but like any CNC (and this is my 3rd), there is a learning curve.