I'll have to make a filter for local stations. One of which is WLW 50kW only 3 miles away by air.
Shift the first LC tuned circuit to the antenna side of the MPF102, otherwise your FET is wide open to powerful signals of any frequency, which will mix & give you unwanted products within your tuning range.
Try to look at some old tube type receiver designs, they did things for good reasons.
I used to work at a combined AM Broadcast & HF radio Comms station, in the lunchroom of the separate Comms building, we had an old domestic mantel radio.
It could receive other AM stations, while being, maybe 300metres away from the "Dual Mast" which was radiating 55kW from one station, & 10kW from another.
PS: You will get mixing products from D4 & D5, too!