Hmm...let me.see.
These ships are going to be built at Chittagong drydock. Is the upgradation of Chittagong drydock completed ? How many years would it take ?
Have BN selected any design yet so that we can assess it's capability ? No.
Did they complete the tendering process & sign the deal ? No.
And what's the build period/delivery schedule given that it's the first time you are building a warship & you only have one shipyard constructing it ?
Basically BN frigate as of now is vaporware. It'll take years for the keel to be laid. It taking on IN with your armament wish list may take even more years. (You can only guess what IN would have then)
BTW, Your country (No, not BD but the UK) wants to build Type 31 GPF with almost the same price tag as the proposed BN frigate. You can look up it's capabilities if you want- Google ''BAE Leander Class''.
Starting from a very low base. And no, it's yet to start.
It's like a student who scored pass marks in one exam claiming that he is performing better than the other student who is consistently scoring above 80% & trying so score above 90%.
Look up Eastern Naval Command, Indian Navy.
As I said earlier, UK law enforcement agencies should look into this problem of high weed consumption among British Bangladeshis.