Contact Resin is still available here
https://www.ebay.com/sch/Tools-Supplies-Engines/2594/m.html?item=152935511533&ssPageName=STRK%3AMEBIDX%3AIT&_ssn=guy-kits&_sac=1
Here's my effort at the IAF museum's 707 static display
This one has the old colors,similar to national airline at that time
the engines are different
Walkarounds at my page below,if needed