[TowerTalk] 40 Meter Vertical Project

[K0YR - Thomas Rieff]

T/T, 
Working on a 40 Meter 2 element vertical beam for an upcoming trip. Built it last weekend and have it suspended between 2 trees pointed to EU. 
Seems to be working OK when A/B compared against the 40 Meter beam also pointed to EU. 
At our trip destination there is a 43 vertical. My thoughts are to put a top hat on this and tune it for 80 meters. 
How would it work to back the proposed 40 Meter 2 element vertical beam against the 80 meter 43 foot vertical and use the 80/43 as the reflector. 
The end result could be a 3 element (maybe only 2, based on room) 40 meter vertical beam with the 80/43 as the reflector. 
Your thoughts, comments and design considerations would be appreciated. 
Tom 

K0YR 
Thomas Rieff 
2059 Sundance Lane 
North Mankato, MN 56003