So I am looking for a desk, yet i want a size that isn’t common among retail desks. because I cannot find a retail desk that fits my needs, i would like to buy a custom desk.

I would like to know a few things:
How much might it cost me?
What kinds of wood are available?
Can a custom well built desk hold up to 250 lbs?
What time frame can I expect will it be completed after purchase?

Other info that might help:
The square foot of desk space will be 3090 inches^2
I would like the desk to be about 28 inches off the ground
I live in the Dallas/Fort Worth area.
I have no prior knowledge of woodworking in any way.

Note: I do understand that kinds of wood available, and the cost are probably dependent of each other, but i mean from a standpoint of not knowing anything what is the average probably.

Thanks in advance for the help!

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