How are you going to do the AGC and the mic preamp? That is which ones? Are you planning on using a different mic? I have just put in a Nextion display, I had previously bought one thinking I might put it in an earlier version but never did, so had the hardware on hand. Main motivation was to get my paddle to work right, haven’t tried it yet.... I might add a broadcast hipass filter, doubt I need it but it’s easy and I have done it before.