I think it would be better to split off 15" and 17" as sperate models. I would really like a numbpad but it seems like other people do not. having the numbpad for the 17" would be a compromise. whichever is built they should be compatible with the current I/O cards for the 13".
right now i don’t use my laptop for gaming but i might need to use it for cad work in the future so having a better gpu would be nice. but if we are going to keep the modularity stuff having an MXM slot for the gpu would be preferable. but that would take up more space so it would probably only happen in the 17".
i think both should have a permanent full sized ethernet port or at the least an I/O card that sticks out past the laptop to get a full size ethernet port.
As someone who upgraded from a hp pavilion g6-1d73us the trackpad feels plenty big and doesn’t interfere with typing.
the biggest thing for me is whether or not it is compatible with the 13" motherboard. if you are going to go that route i hope it has the option to have its own motherboard. that would mean the 15" could use the 15" mobo or the 13" and the 17" could use the 13", 15" and 17" mobo. kinda like having itx, matx and atx boards for desktops. and if you are using and undersized mobo maybe to make sure all the ports work a separate daughter board to act as a hub. and this would let the 17" have an MXM slot while also having the ability to get a bigger battery if the smaller mobos are used.
Another idea i had is to make a standard for the cpu to be slotable. yes you could just use desktop parts that have a socket or you could use mobile parts on its own MXM style card. that way if you want to go from the 15" to the 17" you can just get the motherboard (or not even a mobo if the 17" can handle the 15" mobo) and chassis and move over your cpu, ram, storage etc.
for me a touch screen is not need but i think having the option to upgrade to one is cool. having an artist grade touch screen to me would mean the laptop would also have to be a 2in1 which would greatly increase complexity which i don’t think is good as such an early stage in the company’s growth.
last thing i dislike having the function keys be set to media and screen controls by default. i would rather they be normal function keys and to access the media and screen controls to the fn + key.