Hi Robert and welcome to the Guild.

I might be interested in helping out on this one. I've linked a couple of recent pieces that might be relevant:

https://www.cartographersguild.com/a...8&d=1509751284
https://www.cartographersguild.com/a...1&d=1510061378
https://www.cartographersguild.com/a...9&d=1509572990

Your deadline sounds more than adequate and I think including the tunnel shouldn't be too much of an issue either.

You can reach me at gshipp [at] lostinmaps [dot] co [dot] uk. I hope to hear from you soon.

Cheers,
Greg