That's a great looking board and I see that the seller offers a nice power supply and everything else you need to put it together. I've been thinking of building something similar and placing it in a wooden cigar box.

I looked again on the ebay link I provided and noticed that Arjen Helder does offer a tube preamp. He has fluent English and will answer questions better than most of the Chinese ebay merchants. You could discuss impedance issues with him.