On the APC front, there are many DA options.
- the Fox scout hover, trimmed of turret & dish, is a good heavy hover APC, with a nice big hatch at the back. I often trim the tailfins, and sometimes the cockpits, to make it look a little different.
- Saxon hover APCs make great Saxons, or you can remove the turret for more heavy hover APXs.
- Giggins, with or without turret, are ideal as wheeled heavy APCs
- the Aesir, sans turret, is great too - I've headcannoned it as a "heavier APC", with 8-9 tons capacity, filling the Maxim hole, for a short company, or 2 lances of BA.
The ultimate tracked APC is the W40K epic Rhino. They've got that M-113 vibe with attitude. Stick one on a hexbase with some free-standing infantry, and you've got your mechanised platoon.
While not Squadron minis, I did pick up a couple of packs of 1:300 USN fighters. Most will be converted into BT conventionals, but the Vikings will become Planetlifters ;)
Then, you can always make conventionals out of balsa & styrene ...