Shipbucket

Not bad, not bad at all. The only problem at this point is that both air search radars you've used are 10-15 years too new for a new-build 5/38 destroyer (leader). SC-2 seems most likely to me.

Twin 40mm would probably be fit port and starboard, just forward of the boats (or replacing them entirely in wartime).

so should i replace the one on the top or the one below it with an SC-2?

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Don't hit kids....

No seriously, they have guns now.

You should replace the top one and remove the lower one entirely. You're not plausibly shipping two major air search set on a ship this size in this era.

ok so here it is with the updated radar

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Don't hit kids....

No seriously, they have guns now.

The stern looks a bit long compare to the bow, I suggest you to move the superstructure slightly backwards.

Or make the ship shorter.
One nit-pick is that the portholes seem to be placed too close vertically, and that means not enough headroom.

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Thank you Kim for the crest

"Never fear to try on something new. Remember that the Titanic was built by professionals, and the Ark by an amateur"

Also, having a sizeable space between the d.c. throwers and the aft racks; it would make more sense to group them at the stern. but yes, notwithstanding the good effort put in this is a very large hull for the actual weaponry, and I'm not sure if this would be economic.

ok only main difference is the length, it is now shorter

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Don't hit kids....

No seriously, they have guns now.

This strikes me as a plausible destroyer-leader.

She's an exceptionally well-balanced little ship.
Handsome, capable, and historically possible.

Would have made a respectable station ship, or a very good post-war export design.