I elected to have a hired gun fabricate my avionics bundles. A while back I coordinated the purchase of the magic boxes with Brad Brensing from Garmin and Levi Self from Midwest Avionics at Lee Summit airport. All the boxes were delivered to Levi, and his guys built the bundles and bench checked everything. I didn't want to trust all that expensive stuff to FedEx, so I was going to drive to KC to pick it all up, but Levi and one of his guys (Tony) offer to fly everything down in an RV10, so I met them at Stearman Field for lunch and to pick everything up. Really happy with my decision to work with these guys. Levi is currently flying a friends RV10, used to have a RV6, and is building a 7. Tony is flying a non-Rv EAB, but I don't remember what flavor. Both of them are former Garmin employees and really easy to work with. For future reference, I paid $33,891.98 when they ordered the boxes, which was the cost of the hardware, and the balance of $6,310.14 today for the parts and labor to build the harnesses. This includes a $400 credit for Garmin bucks that they gave me for committing to purchase during the timeframe they were giving credits in conjunction with the oshkosh show discounts. Total avionics cost; $40,202.12. This is obviously a big chunk of cash, but something interesting here; The rule of thumb everybody talks about is the rule of thirds; cost breakdown is 1/3 airframe, 1/3 avionics, 1/3 engine. I believe due to careful shopping, I'll come in significantly under $40k on the airframe. Also, if bought that Thunderbolt IO390 today it would be $50,198. I ordered it 10-28-20, which was before the last 2 price increases and got it for a cool $37,179. I still have to buy a prop, but saving myself a cool $13k on the engine makes me feel better about writing that big check for avionics. I started this project hoping to be flying before paint and interior for around $100k and it looks like we'll probably come in around $115k, which I'm going to call a victory with the project creep of a monster Thunderbolt engine, a full IFR touch screen glass panel and a planned for sweet composite prop.