Why is the trigger part detachable? cant think of any time I wanted to use a cordless drill without actually being able to switch it on. If that's the bit that contains the battery then is it a good idea to make and break the switch connections every time you put it on charge? And a drill isn't about a 'user experience' it's about getting the job done first, and being comfortable and convenient second. Your pictures don't show us where and how the spirit level attachment is used. And the bit at the front will stop it going into a holster. In my experience, any tool that has bits that slot on and off end up with bits lost. If it's that important it should be on the drill full time, the user should not have to stop and unclip every 2 seconds.
I would suggest you look at existing modern drills and first understand why they are designed as they are and then try and match that first before looking for improvement.