Cajunpen mentioned above the importance of a “dead flat” assembly table, flat, ridgid and level. Reinforce the edges so that they can be used as points to clamp. The majority of the wood I use is less than ideal, twisted cracked and such, but these scraps are breathtaking and often times they are overlooked and discarded, so the price is always right. But if you were to try and joint or plane the entire board, you will be left with a veneer. Focus on the area of the joints, build from the gound”your table” up. For me, tight joints and a dead flat smooth top are what I notice.
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