Did you read this thread: CNQualityGoods Zooming 1x18650 generic host (No longer available) and the Ahorton aspheric lens
It needs a bit of work but it seems this host http://www.cnqualitygoods.com/goods.php?id=1957 is a good start. I was considering it myself but havn’t ordered yet…
Most cheap zoomies have hollow pills nowadays, I’ve already modded two SK98/SH98 and an older “Aleto” Zoom (similar to a Sipik SK96). The last one I’ve got - a cheap Ultrafire from eBay - had also a hollow pill, the star barely sitting on a small edge.
P.S.: If your budget is $70 there might be better options to go…