I won't be doing the re-basing just yet but I will be putting up pix of the bases themselves on the Blog on Sunday. As soon as I get around to re-basing a few minis, they will get the WIP treatment and will be shown off.
When I normally base miniatures I super glue them into their slots in the base and then fill the gaps with green stuff. I then PVA gue on sand and paint them.
The best way I have found of removing the minis from the slotta-bases is to snap the bases off along the line of the tab and then cleaning off the green stuff.
To base them on resin bases, I will be snipping of the tab, filing the feet flat, drilling a pin hole into the base of the feet (and also drilling a hole in the resin base) and then super-gluing them to the resin base with a pin to hold it. If I have any problems with lining up pins, I'll just pin one foot and glue the other one down without a pin...it should be OK

. If I have problems with getting a flat area on the base, I'll just blob a bit of Green-Stuff in and make a flat surface.
I really would recommend these resin bases as they are very spiffy

.