That's a classic, the Alpina... Definitely right up there with the early MTB classics. I'd say hold on to those derailleurs... The Suntour Mountechs were EXCELLENT derailleurs, and they're pretty rare. I have a lugged 1985 Stumpjumper (that's pretty much original with Suntour XC, except I've turned it into a commuter), a customized lugged 85 Stumpjumper Sport (with internal-geared SRAM P5 5-spd hub), and for my latest project I'm building up an 86 Rockhopper (TIG'ed frame) with bullmoose handlebars, a SRAM S7 7-speed internal gear hub and a SRAM iLight front generator hub with a custom LED generator light built by JeffDawg, aka Dr FrankenLight...
Here are links to some pictures:
85 Stumpy -
http://flickr.com/photos/16461051@N04/sets/72157606654434569/ (The shifters and derailleurs in the pics are Shimano Deore; very nice, but replaced with the Suntour XC - even nicer)
85 Stumpy Sport - The Peace Bike
http://flickr.com/photos/16461051@N04/sets/72157607969345534/, which features a 2-tone paintjob from the Color Factory, and I laced up the rear wheel with the P5 hub... which is one of the only internal geared hubs that will fit the 126mm rear spacing (probably the same on your Alpina, or yours may be 130).
There's SO many different ways to set that bike up... Having it clear-coated might look slick...Or send it to the Color Factory in Waretown... They did a splendid job on my wife's Stumpy Sport for about $200 (and that included bead-blasting, epoxy-primer and Imron paint). You can easily go fixie/flip-flop SS with the horiz dropouts or do an internal hub like mine...
I live up 206 in Montgomery... Stop by to see my bikes if you want ideas...email me.
Peace,
BB