Nice!
This project also works really well with the MN3004 BBD. Clock needs to be adjusted and the clock cap needs to be upped to 27-30pf to get the frequencies correct. 20-800kHz clock range, 40 to 1! You can go down to 17kHz for a slightly wider sweep but watch for noise on the low end of the sweep.
Oh yeah, the MN3004 is 14 pin and MN3007 is 8 pin, just chop the extra legs off the MN3004...