Finally a completed study desk.
4 layers of BLO, shellac, wipe on Poly and completed with bee-carnauba-home-mix-wax. The result is acceptable, it is hard to achieve a satin rich finish. It seems that either I could have a rich and glossy finish or a dull and subtle finish but not in between. Since I like to maintain the rustic maple surface, yet to bring the rich grain from within and still provide a certain protection, I apply the layers accordingly. Perhaps it is the technique that I am missing or probably I should really look into french polish, rich yet not plastic-hy like what poly does.
Spalted maple looks awesome, yet it seems it does not blend in with Pine well. Well, I shall look for another combination for the coming book shelves.