One alternative is to get some copper end caps and screw them into the top of the mounting board. Then you have two choices:
1) Press the mounting tubes into the end caps on the mounting board and you’re done.
2) Kind of cleaner looking: Cut a slightly larger copper tube/pipe that will fit over the end caps mounted on the board. Cut it to fit exactly between board and model when the existing tubes are pressed into the board’s end caps. This then becomes a sleeve that fits over the existing mounting tubing plus the exposed end caps on the board. Then you just put that pipe over the end cap then put the model into place with the current standoff tubes fitting into the end caps on the board. The outer/sleeve tube will look like a single standoff going from board to model. You could even kind tap the sleeve into the mounting board to score an indentation the sleeve would fit into to make it look perfectly flush with the mounting board even if you cut the sleeve tube “not square”.
For inside the PVC tubes, you should be able to screw/bolt the copper (or even PVC pipe end caps) to the tops of all three tubes easily enough. Then it works like above: slide the mounting tubes into the end caps inside the model.
One alternative is to get some copper end caps and screw them into the top of the mounting board. Then you have two choices:
1) Press the mounting tubes into the end caps on the mounting board and you’re done.
2) Kind of cleaner looking: Cut a slightly larger copper tube/pipe that will fit over the end caps mounted on the board. Cut it to fit exactly between board and model when the existing tubes are pressed into the board’s end caps. This then becomes a sleeve that fits over the existing mounting tubing plus the exposed end caps on the board. Then you just put that pipe over the end cap then put the model into place with the current standoff tubes fitting into the end caps on the board. The outer/sleeve tube will look like a single standoff going from board to model. You could even kind tap the sleeve into the mounting board to score an indentation the sleeve would fit into to make it look perfectly flush with the mounting board even if you cut the sleeve tube “not square”.
For inside the PVC tubes, you should be able to screw/bolt the copper (or even PVC pipe end caps) to the tops of all three tubes easily enough. Then it works like above: slide the mounting tubes into the end caps inside the model.