LTT DEPARTS INTO IMC. DEP CTLR VECTORS FOR TFC. QUESTIONS CLRED ALT.

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I WAS FLYING AS FO ON AN SA-227 WITH A NEW CAPT WHO HAD JUST COMPLETED HER INITIAL OPERATING EXPERIENCE. SHE RECEIVED THE CLRNC WHILE I WAS BOARDING THE PAX. ENG START AND TKOF WERE UNEVENTFUL AS WE COMPLETED OUR CHKLISTS. UPON REACHING THE DEP END OF RWY 7 AT TOL; WE CONTACTED THE TWR. WE WERE ISSUED TKOF CLRNC AND THE CTLR REQUESTED A QUICK R TURN TO 230 DEGS FOR TFC. THIS WOULD EXPEDITE OUR WAY ON COURSE TO IND. I READ BACK THE CLRNC; 'ACR X CLRED FOR TKOF RWY 7L; CORRECTION R; TURN 230.' WE TOOK OFF AND MADE THE R TURN AS REQUESTED. THE CTLR THANKED US AND HANDED US OFF TO DEP. DUE TO THE REQUIRED TURN WE WERE CLBING AT BEST RATE; IN EXCESS OF 2000 FPM. WE CHKED IN WITH THE DEP CTLR AND TOLD HIM WE WERE CLBING TO 5000 FT. AT APPROX 3000 MSL WE ENTERED A BROKEN LAYER OF CUMULUS CLOUDS. THE CTLR IMMEDIATELY GAVE US HDGS FOR TFC AND CALLED IT OUT TO US. WE TOLD HIM WE WERE IMC. A FEW MOMENTS LATER; HE ASKED FOR BEST RATE OF CLB; AS CONFLICTING TFC WAS AT 4000 FT. WE QUICKLY CLBED THROUGH 4000 FT AND LEVELED AT 5000 FT. THE CTLR THEN ASKED OUR ASSIGNED ALT WE RECEIVED. I CHKED WITH THE CAPT AND SHE VERIFIED OUR INITIAL CLB CLRNC SHE RECEIVED FROM GND AS 5000 FT AND I REPLIED TO THE CTLR 5000 FT. HE THEN ASKED US TO CALL THE FACILITY WHEN WE ARRIVED IN IND. I COULD TELL BY HIS VOICE WE MUST HAVE BEEN FAIRLY CLOSE TO THE TFC BECAUSE HE SEEMED SLIGHTLY SHAKEN. WE CALLED; AND APPARENTLY; WHEN WE RECEIVED OUR TKOF CLRNC; WE WERE GIVEN 3000 FT AS OUR INITIAL ALT. NEITHER MYSELF OR THE CAPT HEARD THE CLRNC OR ACKNOWLEDGED IT UPON RECEIVING OUR TKOF CLRNC. APPARENTLY; THE CTLR MISUNDERSTOOD MY READBACK OF THE TKOF CLRNC AND DID NOT CORRECT MY READBACK. MY ONLY FEELING THAT THIS COULD BE CORRECTED IS FOR PLTS TO READ CLRNC BACK COMPLETELY WITH THE FLT NUMBER; AND IF INCORRECT; IT MUST BE CORRECTED; OTHERWISE THE BUILT-IN SAFEGUARDS FOR ISSUING AND RECEIVING CLRNCS BREAK DOWN AND CAN LEAD TO POSSIBLE INCIDENTS OR ACCIDENTS.