Considering buying a Glasair II that currently has a vacuum 6 pack, a single king VOR nav/com and an old transponder. I would be planning an upgrade to more modern panel and trying to figure out the best value. Wish list is: ADSB Second com IFR GPS Removal of the vacuum system Thinking of trying to cheapskate it this way: Used audio panel of some sort - $1k echoUAT - ADSB out/in -$1.5k Used Garmin 300XL - LNAV and com - ~$2k 2 G5s - covers 6 pack and HSI - $3k Later on wish list: Garmin 175 for WAAS approaches. - 4k Garmin autopilot ~2k A few questions I have been having a hard time finding answers to: Will a standard mode S transponder and echoUAT cover me for travel to Canada, Europe, and central/South America or should I get a better transponder initially? Is it reasonable to expect to get a good few years of service out of a 300XL? Are there major complications to avionics installs? I have done installs of electronics on boats and it looks to be a similar process.