Hey capecodjim, where did you buy those little pump bottles?
This looks like a very good addition for me to use (since I drive in the dark a lot

) I'm thinking about going with your Puck driiper pump idea with the 4AA box and using a 4AAA battery holder inside. I will just make it a dripper. I've played around with bottom feeding 901 attys and I don't really like it. It seems to lose some of the flavor. Dripping however, keeps the flavor. Your idea is a perfect match for that.
I've also done the sqeeze bottle inside but care for that either too much because it's a pain to cut the holes and make it look good. I'm not a perfectionist (well, maybe I am) but I like it too look good since I get a lot of questions about what I'm "smoking"

Your little pump bottle looks perfect
The bottles came from
here on ebay. They're listed as 3ml but hold around 8ml and from the threads down is the same size as a 14500 battery.
The Pump-A-Puck has been my main vape since it was made. I cannibalized a 4 x AAA box for the battery contacts to keep it easier but you could modify the ones from the AA box.
A couple suggestions:
Run the hose down a hole near the pump button and back up near the atty so the excess hose can be kept inside. Use a fire button that's taller than the pump so you can rest your thumb on the pump and fire easily. I didn't use that elastic after the first hour and the hose stays right in place. Connect the hose to the pump cap first because that's the most critical and run the hose through the unit before connecting to the cart end!
Put the positive lead of the LED to the left. Then you have room for the resistor w/o squishing it in and the neg LED lead is right at the neg atty contact for easy soldering. One switch lead has the neg battery terminal of the left most battery soldered to it. Measure with a battery in place and bend the switch lead at the proper length before soldering.
Route the hose from the back to the front so it will sit on top of the batteries, not under them. I have it under some wires but would route it over them. I'm going to fix it when the unit fails but that hasn't happened yet.
To retain functionality of the main switch w/o wires, I cut the metal battery contact terminal in half. (It was one piece and connected the neg terminal of the right most battery (#1) to the pos terminal of the one to the left of it (#2)). Then I ran a jumper wire from the right most switch contact to the positive battery terminal plate(#2). The negative terminal plate of battery #1 is connected to the middle contact of the switch so when the switch is off it breaks the connection between the two batteries.
The batteries are staggered with the two to the right higher than the other two because it fit better that way. The pos terminal contact of the right most battery can be soldered right to the bottom of the atty connector.
The system has worked flawlessly and I'd highly recommend trying it. The AA box is on the large side but not huge and fits well in the hand and pocket. You have to be careful but it's not fragile. It can roll around the car or coat w/o the hose getting snagged or it spilling or breaking.
Pumping into a cart filler hits the same as dripping but I like it better because you get more warning before it goes dry as a signal to pump. With the cart the vape tapes off and weakens. With the straight drip you can get a slight burnt taste when it starts to dry.
Good luck! I'm looking forward to some feedback from you guys and hope you like it!
btw: Puck, I never would have taken the construction pics if not inspired by your tutorial. I agree 100% about helping people off analogs with mods too!
Edit: Puck, I just thought of a new design concept in true puck form.... A 4 x AAA box to house the batteries and a 2 x AA box attached back to back to hold the atty and juice bottle. It would make it a lot easier to change the batteries, the atty could be recessed inside the box and it would be easier to build also.... hmmmmm......