Time for a progress report!
The calculator part of the application is coming along great; currently, it can negate, add, subtract, multiply, divide, exponentiate, and take modulos, exponents, percentages, and factorials!
What's left to do:
-Add in variables
-Add in mathematical functions (sin, log, sqrt, and stuff like that)
-Add in user defined functions (if I can - Fyron wants 'em and it shouldn't be TOO hard, just string replacement

)
-Add in functions that return strings, not just numbers (if I can - would be useful for generating Roman numerals for components)
-Finally, write the application that parses the SE4 data file templates and generates the actual data files!
