I took a look at the energy field routines while eating lunch, so here's a new build in just 2 days rather that a few weeks

• each station type (Horizontal and Vertical) has its own Energy Field design (2 flickered shapes for each design)
• last Energy Field flickered shape kept track for each station, so Energy Field will always alternate between its 2 shapes regardless of Station flicker rate.
• Added X-Y check to make sure energy field is onscreen before drawing it. This appears to have fixed all the drawing glitches

ROM

draconian_20140428.bin

Source

Draconian_20140428.zip