UNAUTH CLASS B AIRSPACE PENETRATION AFTER ALT OVERSHOT FOLLOWING A HDG TRACK DEV BY AN LR35 FLT CREW DURING A VFR DEP FROM SMO; CA.

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JUST BEFORE DEP; SOCAL APCH WAS EVACED AND SHUT DOWN BECAUSE OF LCL WILD FIRES. NO IFR DEPS WERE AVAILABLE FOR SANTA MONICA ARPT. AFTER STUDYING THE PUBLISHED TFR'S (FOR FIRES) AND THE APPROPRIATE CHARTS; WE FOUND AN APPROPRIATE RTE AND DECIDED TO DEPART VFR. WE DECIDED TO FOLLOW SANTA MONICA'S NOISE ABATEMENT PROC WHICH LEADS YOU VERY CLOSE TO LAX CLASS B AIRSPACE. ALTHOUGH WE TURNED PRIOR TO ENTERING CLASS B AIRSPACE; WE MAY NOT HAVE STARTED THE TURN EARLY ENOUGH. WE MAY HAVE ENTERED CLASS B AIRSPACE. SOON AFTERWARD; WE LEVELED AT 4500 FT MSL UNDERNEATH CLASS B AIRSPACE. WE FOUND OURSELVES BOXED IN BY A PLUME OF SMOKE FROM A FIRE; ALTHOUGH THERE WAS NOT A PUBLISHED TFR ASSOCIATED WITH THE SMOKE; WE COULD NOT MAINTAIN VFR IF WE FLEW THROUGH IT. WE CLBED AND MAY HAVE ENTERED CLASS B AIRSPACE AGAIN. SOON AFTERWARD; WE PICKED UP OUR IFR CLRNC AND PROCEEDED UNEVENTFULLY TO OUR DEST. ALTHOUGH WE DID NOT CAUSE ANY TFC CONFLICTS (OUR TCAD WAS CLR THE WHOLE TIME); IT WAS NOT A GOOD IDEA TO DEPART VFR IN A JET ACFT. CTLED AIRSPACE BOUNDARIES ARE SOMETIMES DIFFICULT TO IDENT INFLT; AND THINGS HAPPEN QUICKLY AT 200 KTS. ALSO; THE LCL FSS MAY HAVE FALLEN BEHIND IN ISSUING TFR'S. WE MAY HAVE FLOWN THROUGH SOME AREAS THAT WERE NOT TFR'ED; BUT SHOULD HAVE BEEN.