Limits of EM Forward Modeling Capabilities

I am interested in Simpeg but I want to find out if it fits what I
want to do. I have created the method I am calling
Interferographic TEM (ITEM), applying field interference concepts to
do TEM beamforming in the subsurface. Right now I am sticking to 2D
configurations - a long H(B) profile above a vertical E section in the earth,
both repeated for each source position. I work with both grounded
wire and large loop sources. I am hoping Simpeg can do forward EM
model calculations supplying H (B) profiles on or above (with drones)
the earth surface and subsurface E distributions on a grid as
functions of both source position (i.e., multiple sources) and time.
A simple starting reference model might be 1D, but for subsequent
iterations I would use an ITEM subsurface resistivity image as a new
reference model (so, 2D/3D that is very general in which each grid
element will have a different resistivity value). So my question
would be: Can Simpeg handle this, as currently available?
Most (all?) of the commercial modeling codes are too expensive for me
(the necessary infrastructure also). What would be the minimum
requirements to properly do Simpeg modeling? If necessary I could
use frequency domain calculations and transform to the time domain using
Walt Anderson’s (USGS) digital filters (which I have converted to Matlab);
that is what I do currently. If the frequency domain calculations are better
(or more fleshed out) than the time domain calculations, that is.

Bryan James
Electromagnetic Geophysical Imaging Solutions

As far as I know, 1D EM modelling in Simpeg is based on empymod which allows for the calculation of the 3D field response from a 1D layered model with any source/receiver configuration. On the other hand, there is example of Oldemburg et 2018 ( GitHub - simpeg-research/oldenburg-2018-AEM: 3D EM Modelling and Inversion with Open Source Resources) applying Simpeg for 3D Em modelling,however it has a significant computational cost. Another alternative faster for 3D EM modelling could be CustEM.

Thanks for your response! This is good to know, before I spend effort in any particular direction. I am actually interested in both cases - 3D response from a 1D earth, and 3D response from 2D/3D earth. I will look at the Oldenburg et al paper as well as check out custEM. Thanks!