I don't have time to print this for a few days butif anyone wants to comment please do, You can help, especially with verifying measurements or improving layout.
improvements under consideration: ( Strikeout = Done)
-print a single layer mask with button holes to verify correct button placement(save print feedstock)
-making the through holes slightly cone shaped to match the tapered pusher pegs on the buttons.
-splitting the gripper into two pieces and connecting with screws to make slicing and 3D printing easier
-removing plastic from the area below the keyboard
-thinning the plastic holding against the battery cover
-rounding edges
-improve ergonomics
-make second version sized for standard N900 without Mugen extended battery covers
-redesign buttons and d-pad as two parts, the button side and pegs inserted from the back into holes on the buttons
-If gripper shell is split into two pieces use stainless allen screws facing forward to look extra cool.
-respond and include feedback or contributed code
-shrink buttons and dpad by 0.2mm on edges so they don't stick