Size and weight viability for my sim design

Hi

While I'm researching about the Monster Moto Shield, I started to design the motion sim strcutre.

I don't have experience in this, also I suck on drawing and in protyping. For those reasons I want to replicate the model made by RacingMat, maybe doing some modifications like a wood platform instead of two rectangular tubes or some hang-on for the user to get in and get out of the structure more easily.

But I've got some questions that I need before the final design

1. I am 1.84 meters tall, and measuring the RacingMat's design (from the chair to the pedals) it was ok for me, but I want to share the structure with friends, and they are more smaller than me (let's say 1.65 - 1.70 meters). Maybe I can't move the chair forward/backward (because the center of gravity) but it's possible to move the pedals and maybe the wheel without giving the wiper motors more effort to move the platform? For that I have to figure out how to move the pedals and wheel acording to the person.

2. In a future I want to share the structure with the public, install it in some conventions and let the people play on it (yes, I need to speak with the admins about that). An idea that I have for the people is to step on the platform and sit (that's why i've said a wooden platform instead of rectangular tubes), but comparing with RacingMat's design it will break up for the frontal weight when a person is getting in. Maybe installing the wiper motors in front of the motion sin instead of behind the platform will equilibrate the weight. Is that factible?

Later i'm going to share some draws about what i'm talking about, i'm short of time u.u

What DOF must be applied in that case??

Pedro, at first on my project I was thinking about built a platform system, but after a few test with the same problem with the pedals, etc... Finally I decided to build the system for moving only the seat and let the steering/brake apart.
http://www.xsimulator.net/community/threads/my-new-proyect-2dof-racing-seat.8540/

As you can see there is no more problem about the height or the weight of the user, and you can put some kind of extensible tube, between the seat and the pedals.

There is another advantage in this kind of design, the seat is closer to the floor. Is easier to sit on it, and thanks to the fewer total weigth of the structure the motors don´t need to be very powerfull.

Thanks @chu and @noorbeast for those tips. This is my first attemp to build a motion sim strcuture, for now I like to replicate a arcade cabinet and give motion to the chair, but i'm still looking for designs and sizes.