Thank you for your time that you spent researching it really.I don't mind helping... That is what I am in the forum for... Ok so the UVB I spent the last hour scouring their sites lol. I literally can not find where they say if their measurements are through screen or not. I will say they are almost always given not through screen. So if you can do a large gauge metal screen top this is going to allow more UVB to pass through. Which helps not losing half of the output. So I do not think the UVB100 would be ok for a T8 but I think the UVB 150 would be and close to what we consider a UVB 10.0 in a T8 to be. Now they say they print on the box the distance from the fixture for certain UVI levels. So I would imagine again they are basing these on not going through screen. So I would go with the 150 and then let me know what the dang box says because for the life of me I can not find the box image that actually shows what they suggest. lol
Now for the fixture go with what you found. The reflector is a great thing to have but if you can not get it then that is kinda that lol.
The mesh you chose for the sides will be great for the simple fact nails getting caught will not be an issue. Just make sure when you get it that it is smooth no sharp edges to the plastic that might cut toes.
Veileds tolerate lower humidity so if you can at least maintain 30% in the winter with the heat that will be good. You could always do a removable side panel that you can take on and off depending on the season. Ya know like hook it over the screen on the outside?
Now to get him to not climb really not possible unless your going to have solid sides from the top down at least 8 inches which I think will defeat the purpose of what you envision for the enclosure. So this means heat fixture will have to be lifted up off the top at least 4 inches. UVB with a T8 that we are not 100% certain on I do not know that I would lift it more than 2 inches if using a larger gauge screen for the top. If it was a T5 I would for sure.
Their site says that the higher output UVB tubes can compensate for the screen filtering some of the UVB, but they do not have specific measurements for that unfortunately.. i think the information on the box they meant is the table with stars they have on the site i linked before, for veiled they state he should be 20cm or 8 inches from the source, but when it goes through screen I'm sure it can be closer.
So I'll definitely have to go with the kitchen light fixture and i will try to make a DIY reflector, it will be better than nothing. Maybe bending a thin aluminum sheet will be better than tin foil? It will have less wrinkles.. plus UVB150 45cm T8 tube to go with it.
The humidity will not be a problem then, and the removable side panel is great idea!
So the verdict is larger metal screen (can be basic zinc one with plastic coating, gauge size of 13mm?) and then raising the UVB and heat source from that to make sure he don't burn himself. That would mean i have to put basking spot higher to the top screen, the 7 inches from source so 5 inches from top screen for UVB and adjust heating to be 29 degrees at the basking spot?