Holtzy,
If you tell us a little more about your exact wants, we can try to help.
Full scale or reduced scale? Authentic construction or modern/simplified construction methods? What is your height and weight? (Weight is a big factor in balance.)
Albatros:
(Reduced scale)
I've personally chased the idea of doing a
reduced scale Albatros (in my case a DII not a DVa) for MANY years and countless hours of research, and I can tell you beyond a doubt that with the engines currently available, based on MY weight, it is NOT GOING TO WORK. (I weigh 235#) It will never balance without adding a
substantial amount of ballast to the nose, which increases the overall weight, reduces performance, requires a stronger structure, etc.
If you are lighter than my fat butt, you have a much higher chance of success than I would with the same replica.
(full scale)
Full scale aircraft (Albatros) can be done, and there are some folks doing precisely that, but the engine is still problematic. An authentic engine will cost more than the average house, and the alternatives are mostly either a huge compromise on power available due to the difference in operating RPM at the prop, or unproven. Also plans availability is pretty sketchy.
Generalities:
The problem with most German aircraft of the period is the absurdly short nose. That worked in the original because they had big, heavy inline engines which balance the aircraft. They turned huge props at low RPM, producing lots of thrust for the HP of the engine. A smaller prop turning a higher RPM at the same horsepower doesn't produce nearly as much thrust. That is ok in cruise, the speed is mostly horsepower dependent, but the amount of thrust is what determines the takeoff roll and climb rate. (in the same airframe)
Enough research would get you plans for a lot of different aircraft in full-scale using authentic construction methods. Authentic construction of a full scale aircraft is the absolute pinnacle of achievement in replicas. They are all extremely labor intensive to replicate, and require a high degree of patience, dedication, and skill.
The reduced scale aircraft, especially like your description (not absolutely authentic, etc) are much easier and faster to build.
There are plans for exactly ONE reduced scale
German fighter available- that is to use Graham Lee's 7/8 Nieuport plans and his modification suggestions to replicate a Siemens-Schuckert DI. (You could also do a Euhler DI the same way.) You could also potentially use his full-scale Nieuport plans to do a full scale Siemens-Schuckert DI or even a Euhler DI.
Robert Baslee (Airdrome Aeroplanes)
Airdrome Aeroplanes ~ Holden, MO has a number of replica kits available. While kits may seem a costly way to build, it takes a lot of the hassle out of the process, and since you get everything at once (or in sub-kits that include everything for that section of the aircraft) you can potentially save money on shipping and the higher cost of buying materials in small quantities. The Fokker DVII is probably the best of them, and it allows you an almost unlimited choice of color schemes and personal markings.
Both the Graham Lee plans and Airdrome kits are built from aluminum tube and pop rivets. This is a simple, fast method of building.
You mention aluminum angle for construction, so I presume you are familiar with the Texas Parasol? Richard DID put up some "plans" (I put that in quotations because they are not very detailed, more a general layout sketch) of Chuck's SE5A replica done using that method. Not German, but it doesn't have the challenges getting it to balance that the German aircraft do. Those "plans" don't cost you a cent... but understand that there is a LOT of "head-scratching" required, and you will need to get both the regular Texas Parasol plans (for instructions on how to do everything- also free) and the SE5A "plans" to successfully build that aircraft... and again, you will spend a LOT of time figuring out how things should go together.
Hope that is helpful...