This is my design,it may be placed on corrugated roof or flat
roof ,only for corrugated roof must have attachment
(corrugated roof cartridge).
Led's , need just to be inserted
into holder,solder led's whit cable,and all that put in tube (this part looks like test tube)
tube put in bootle and screw up original cap.On cap need's just to bore hole for cable.
Bottle is attached to roof whit (bottle holder's),surrounding bottle and seal between bottle and bottle holder's and make It is watertight.Whit another seal can be put on flat roof.
Battery's are under solar panel in box.

-Tube,Led holder -must made from clear plastic to allow light to pass
-To prevent leakage some parts can sealed with silicon
-On some places number of screws can be reduced