rotate the jet/hole pattern by 90 degrees to better cover the "heat signature" of the rectangular T-bred core, either that or add another 3 jet holes to either side of your existing design, the holes in the base that aren't "recieving" jet's are doing buggerall and should be omitted for strength.
looks good.
oh, remember to try and aviod large spans of thin base plate, it will tend to bend on you.