Build me Keypad & Mouse combo

Looking for anyone who can help in my project to create my first prototype with following   Our device consiting two parts, LHS (keypad/keyboard) & RHS (mouse). 8 buttons are present on both sides with their respective provided controls in the button layout pdf file. There are two buttons present in LHS i.e."G" (when we press analog stick) & "I" (Letter I for India ) & one button "Q" in RHS has its unique feature which I'm referring to as simulation. They change the function of many buttons present on both side LHS & RHS like When we press a button with an assigned simulation feature i.e. Q, G & I, there has to be a 30ms depress time after which function for all the buttons has been changed and Q stops functioning until we release our finger from the tactile switch. Now as we enter into simulation +1, the function of all the buttons will be similar to provided document under Page +1 where two buttons in LHS perform the function of two buttons simultaneously under each button as provided & 3 buttons in RHS respectively. Similarly in other simulations. How buttons with underline perform their function and changing all the buttons to default or previous page? They will make a 30ms depress time after which function for all the buttons has been changed and pressed button stopped working until we press it again with updated controls following buttons must change settings to the default page for all the buttons as they are present in all simulations. "4 in LHS & 3 scroll wheel up with 5 scroll wheel press in RHS"If we went into a simulation under simulation then right after pressing the following buttons all the settings has to be changed to default settings All the buttons other than simulation buttons must function as provided in the video below which shows real depress time as we hold any button for its respective purpose The mouse sensor I would like to use in RHS is Pixart ADNS-3050 I would like to work by following milestones: 1. Hardware Design(Schematic + PCB layout + Gerber + BOM) to manufacture the Prototype 2. Firmware Coding(MCU code where will be used in the project) 3. Prototyping and Testing(make the prototype and test the prototype with the firmware code )