Locksmith: Iron Welding & Gate Lockin Bklyn

Hi All,
We need to replace the lock in our front garden level door gate. The current lock is installed into a single plate of iron and the barrel protrudes out of the front of the gate. In order for the a new lock to be installed securely and flush with the front of the gate, an iron box needs to be made and welded into the gate. Has anyone had this type of work done by a Brooklyn locksmith? If so, will you please post a recommendation and ballpark price? thank you very much!