Welcome Jeff!
Have you seen a 30mm 5000 UWA in the flesh? It's enormous!!
No, 2" EPs won't work with 1.25" barlows: the light from the 2" EP is "too big" to fit through the 1.25" barrel of the barlow. btw Strange selection of EPs in that kit. Big gap between the 18 and 6.7mm.
