Where and how can I get a custom plate? (...questions about builder.swillkb.com)

[Vozella]

Where and how can I get a custom plate for a keyboard?

http://www.keyboard-layout-editor.com/#/gists/4254aca34809c3153d9e

I tried using builder.swillkb.com to make the design.
How much different is the price of the switch types?
Is it possible I can get the switch for the spacebar in the center instead of offcentered?

Edit: Also, how much does it usually cost?

[trenzafeeds]

1.You'll have to have a metal shop make it for you or if you have a fab-lab type place near you, you can probably cut it yourself.
2.Cherry brand switches are around 50 cents each, Cherry replicas are under 30 cents each usually, Alps/matias depends
3.I'm not sure what you mean, the switch for the spacebar should be in the center of your spacebar.
4.A lot