Make my own small computer for the cockpit?

Hi to everyone.

First, I am not sure if this topic is in the right place.

Is it better to make my own interface with small microprocessor card that controls everything in the cockpit such as lights, buttons, switches, FMS, and so on?
I thinking to using LPT or newer USB (but specification is not accessible if I am right); that is much easier to make copy than programming each parts. I will just use the navigation database and DataAccess to access some functions as the height, speed, pitch, roll, flight direction, which are basic functions, and some other functions. So, I thinking that LPT should be enough. Otherwise, I can using Arduino.

What do you think ?

If you have the skills and resources to build your own microprocessor, then by all means, do so. Most people here, including myself, do not have those skills , which is why you don't see custom built microprocessors often.

Also, since when did the IL62 have an FMS? I thought they were from the INS era.

Can't wait to see what you come up with. It's nice to see people who aren't buying another 737NG.

Some newer Il-62M flown by VIM Airlines has the FMS built in, but it is not included by original.

They have these options:
NV-PB
INS-21
KLN-90B
FMS

I will just have NV-PB navigation in the first option. Later I will upgrade to INS-21 when I complete the cockpit because INS-21 is an option. I thinking that I will not build a FMS into this cockpit.

I found that the LPT has 2 MB/s transfer speed. How much is that able to transfer ? 50 instruments ?

I calculated how much the navigation system requires of memory amount. If I am right, it will requires max 8 bytes of memory if I hard code it directly to machine code. Otherwise, it will requires 64 bytes of memory if I do not hard code it; or it will requires maybe 1 MB if I using a pure processor with many I/O ports. Is that correct ?