Falcon heavy upgrade parts (for Antsinafrica's Falcon 9)

For Antinafrica's model (https://www.thingiverse.com/thing:2914233), you can upgrade the falcon 9 to the falcon heavy. The upgrade costs 35 dollars (price on cgtrader).
If you're not interested in the Dragon Capsule and just the 'regular' Falcon Heavy, these are the missing parts I designed myself.

Thanks to AntsinAfrica for the falcon 9 design!

***Update april 24th 2019: I've added the booster connector and updated the base connector pin (reduced in length by 4 mm). Everything is now com